A single View Connection Server is being used for both internal and external access to View desktops. Internal users are able to connect without issue. However, external users receive an error message indicating that the Connection Server cannot be reached. The corporate firewall configuration has been verified and all the required ports are open.

What is the likely cause of the problem?

A.
Port 443 is not open between vCenter and the View Connection Server.

B.
The external URL is not configured correctly in View Administrator.

C.
The Use Secure Tunnel connection to Desktop is checked in View Administrator.

D.
The Connection Server is not on an externally routable network.