Your Exchange Server 2007 organization contains a Client Access server and a Hub Transport server. The Client Access server fails. You need to add the Client Access server role to the existing Hub Transport server. What are two possible ways to achieve this goal? (Each correct answer presents a complete solution. Choose two.)

A.
Use the Add or Remove Programs applet in Control Panel

B.
Run the exsetup /mode:recoverserver /roles:ClientAccess command

C.
Run the exsetup /mode:install /roles:ClientAccess command

D.
Run the exsetup /mode:install /roles:ClientAccess,HubTransport command

E.
Use Exchange System Manager, and configure the server as a front-end server