A corporate environment includes a two-node Exchange Server 2010 Client Access server array. You are designing a disaster recovery plan for the Client Access servers. The plan must meet the following requirements:

* Back up the SSL certificates.
* Back up the Windows Network Load Balancing (NLB) configuration.
* Back up only the minimum amount of data.

You need to recommend the components to back up on each Client Access server.

What should you recommend?

A.
only the system state

B.
the system state and the registry

C.
the system state and the system volume

D.
the registry and the system volume