You have an Exchange Server 2010 SP1 organization named contoso.com. The organization contains two Client Access servers named CAS1 and CAS2. CAS1 and CAS2 are members of a Client Access array named casarray1.contoso.com.

The hardware on CAS1 fails. You need to restore CAS1.

You install Windows Server 2008 R2 on a new server named CAS1.

What should you do next?

A.
Join CAS1 to contoso.com.

B.
Add CAS1 to casarray1.contoso.com.

C.
Reset the computer account of CAS1.

D.
Create a computer account for casarray1.contoso.com.

E.
From the Exchange Server 2010 SP1 installation files, run setup /r:c.

F.
From the Exchange Server 2010 SP1 installation files, run setup /m:recoverserver.

Explanation:
1. Reset the computer account of CAS1.
2. Join CAS1 to contoso.com.
3. From the Exchange Server 2010 SP1 installation files, run setup /m:recoverserver.

Reference:

http://technet.microsoft.com/en-us/library/dd876880.aspx