You work as an Application Developer for PassGuide.com. You have been assigned to create a
WCF service for the Business School of Management. You write the following code segment to
define the service:
Public Interface ISchoolService
<OperationContract()>
Sub FindStudent(int StudentID)

End Interface
Public Class School
Implements ISchoolService
<OperationBehavior(TransactionAutoComplete:=False, TransactionScopeRequired:=True)
>
Public Sub FindStudent(int studentnumber)
End Sub
End Class
Your next task is to set the <ServiceContract> attribute for the transaction behavior of this service.
Which of the following code statements should you insert at the beginning of the above mentioned
code segment?

A.
<ServiceContract(SessionMode:=SessionMode.Required)>

B.
<ServiceContract(SessionMode:=SessionMode.NotAllowed)>

C.
<ServiceContract(SessionMode:=SessionMode.Permitted)>

D.
<ServiceContract(SessionMode:=SessionMode.Allowed)>

Explanation: