A Windows Communication Foundation (WCF) client uses the following service contract.
(Line numbers are included for reference only.) 01 [ServiceContract] 02 public interface
IService 03 ( 04 [OperationContractj 05 string Operation1O; 06 [OperationContract] 07
string Operation2(), 08) You need to ensure that all calls to Operation 1 and Operation2
from the client are encrypted and signed. What should you do?

A.
Set the ProtectionLevel property in line 01 to EncryptAndSign.

B.
Set the ProtectionLevel property in line 04 and line 06 to Sign.

C.
Add a SecurityCriticalAttribute ror each operation.

D.
Add a SecunitySafeCriticalAttribute for each operation.