Which code segment should you use?

A Windows Communication Foundation (WCF) service uses the following service contract.

[ServiceContract]
public interface IService
{
[OperationContract]
string Operation1(string s);
}

You need to ensure that the operation contract Operation1 responds to HTTP POST requests.
Which code segment should you use?

A.
[OperationContract]
[WebInvoke(Method=”POST”)]
string Operation1(string s);

B.
[OperationContract]
[WebGet(UriTemplate=”POST”)]
string Operation1(string s);

C.
[OperationContract(ReplyAction=”POST”)]
string Operation1(string s);

D.
[OperationContract(Action=”POST”)]
string Operation1(string s);

Explanation:
Advanced Web Programming
(http://msdn.microsoft.com/en-us/library/bb472541(v=vs.90).aspx)

Example:

[ServiceContract]
public interface ICustomerCollection
{
[OperationContract]
[WebInvoke(Method = “POST”, UriTemplate = “”)]
Customer AddCustomer(Customer customer);

[OperationContract]
[WebInvoke(Method = “DELETE”, UriTemplate = “{id}”)]
void DeleteCustomer(string id);

[OperationContract]
[WebGet(UriTemplate = “{id}”)]
Customer GetCustomer(string id);

[OperationContract]
[WebGet(UriTemplate = “”)]
List<Customer> GetCustomers();

[OperationContract]
[WebInvoke(Method = “PUT”, UriTemplate = “{id}”)]
Customer UpdateCustomer(string id, Customer newCustomer);
}