Your Exchange Server 2007 organization is configured in two Active Directory sites named Site1 and Site2. Site1 is configured for the 10.10.5.0/24 subnet, and Site2 is configured for the 10.10.20.0/24 subnet.
The Exchange servers in the two sites are shown in the following table

ExchCAS1 fails. Site2 users report that they are unable to access Microsoft Office Outlook Web Access (OWA).
You need to restore OWA service to Site2 users.
What should you do?

A.
On ExchMbCAS1, create a new OWA virtual directory

B.
Move the mailbox configuration of the users on ExchCMS1 to ExchMbCAS1

C.
Add the Client Access server role to ExchHub2

D.
Add the Client Access server role to ExchHub1