You are developing a Windows Communication Foundation (WCF) service that returns location information for authorized law enforcement agencies. The service contract is as follows.

Users are authenticated and impersonated. The system uses ASP.NET roles. The members of law enforcement are members of the LawEnforcement role.
You need to ensure that only members of the LawEnforcement role can call these methods.
What are two possible ways to achieve this goal (Each correct answer presents a complete solution? Choose two.)

• A. Add a PrincipalPermissionAttribute to each method that should be available only to members of law enforcement. Set its SecurityAction to Demand and set the role equal to LawEnforcement.
• B. Use the CurrentPrincipal property of the thread. Call the IsInRole method specifying LawEnforcement as a parameter.
• C. At the beginning of each method, enumerate each ClaimSet in a new WindowsClaimSet. Use the FindClaims method to locate a claim type named Role with a right named LawEnforcement.
• D. Create a GenericPrincipal specifying Thread.CurrentPrincipal.Identity as the IIdentityParameter and LawEnforcement as the only value for the Roles parameter.

You are developing a Windows Communication Foundation (WCF) service to provide shopping cart support. ASP.NET compatibility mode is not enabled.
The shopping cart information must be retained across user visits to the store until the user explicitly empties the cart or submits the cart contents to order.
You need to implement the service as a DurableService.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

• A. Create the persistence provider database and configure the persistenceProvider element of the service behavior to point to that database.
• B. Use wsHttpContextBinding for both the client application and the service.
• C. Use basicHttpBinding for both the client application and the service.
• D. In the method to add an item to the shopping cart, serialize the shopping cart contents after adding the current item and storing it in a Session variable.

You develop a Windows Communication Foundation (WCF) RESTful service that provides media streaming services.
The service includes the following code. (Line numbers are included for reference only.)

The service must return an XML response.
You need to apply the correct attribute to AddMediaTitle method.
Which code segment should you insert at line 05?

• A. <WebInvoice(ResponseFormat :=WebMessageFormat.Xml, BodyStyle:=WebMessageBodyStyle.Wrapped)>
• B. <WebInvoice (ResposeFormat:=WebMessageFormat .Xml, BodyStyle :=WebMessageBodyStyle.Bare) >
• C. <WebInvoke(Method:= "POST")>
• D. <WebInvoke()>

You are consuming a Windows Communication Foundation (WCF) service. The service interface is defined as follows.
<DataContract(Namespace:="")> Public Class Item End Class ServiceContract (Namespace: ="") > Public Interface ICatalog <OperationContract()> <WebInvoke(Method:="POST*', UriTemplate:="/Item") > Function Updateltem(ByVal item As Item) As Item
End Interface
The client application receives a WebResponse named response with the response from the service.
You need to deserialize this response into a strongly typed object representing the return value of the method.
Which code segment should you use?

• A. Dim s As DataContractJsonSerlalizer =
  New DataContractJsonSerlalizer(
  GetType(Item))
  Dim item As Item =
  DirectCast(s.ReadObject(
  response.GetResponsestrearn()), Item)
• B. Dim r As XmlDictionaryReader =
  JsonReaderUriterFactory.CreateJsonReader(
  response.GetResponseStream(),
  XmlDictionaryReaderQuotas.Max)
  Dim s As DataContractSerializer =
  New DataContractSerializer(GetType(Item)
  Dim item As Item = DirectCast(s.ReadObject(r), Item)
• C. Dim f As BinaryFormatter = New BinaryFormatter()
  Dim item As Item =
  DirectCast(f-Deserialize(response.GetResponsestream()), Item)
• D. Dim s As DataContractSerializer =
  New DataContractSerializer(GetType(Item))
  Dim item As Item -
  DirectCast(s.ReadObject(response.GetResponsestrearn()), Item)

A Windows Communication Foundation (WCF) service is generating a separate namespace declaration for each body member of a message contract, even though all body members share the same namespace.
You need to simplify the XML representation of your message contract so that the namespace is only declared once.
What should you do?

• A. Declare all of the body members as properties of a separate MessageContract class and use the class as the only body member of the message contract.
• B. Declare a wrapper namespace for the message contract by using the WrapperNamespace property of the MessageContract attribute
• C. Declare all the body members as properties of a DataContract class and use the class as the only body member of the message contract.
• D. Explicitly set the Namespace property of all the MessageBodyMember attributes to the same namespace.