问题：

[单选]

Click the Exhibit button.

The resource requested by the RequestDispatcher is available and implemented by the Destination Servlet.
What is the result？（）

A . An exception is thrown at runtime by SourceServlet.
B . An exception is thrown at runtime by DestinationServlet.
C . Only "hello from dest" appears in the response output stream.
D . Both "hello from source" and "hello from dest" appear in the response output stream.