You develop a Windows Communication Foundation (WCF) service. It is used exclusively as an intranet application and is currently unsecured. You need to ensure that the service meets the following requirements: The service now must be exposed as an Internet application. The service must be secured at the transport level. Impersonation and delegation cannot be enabled. What should you use? （）

• A、basicHttpBinding and HTTP
• B、basicHttpBinding and Kerberos
• C、wsHttpBinding and Kerberos
• D、wsHttpBinding and HTTPS