How does Exchange 2010/2013 enable the use of virtualized environments?

A.
It allows comprehensive e-discovery against all emails stored in the Exchange archives.

B.
It provides automated deduplication to reduce the size of stored files.

C.
It enables IT to reuse unallocated disk space and host all mailboxes on local servers.

D.
It places less demands on storage, thus enabling the use of SAN storage architectures.

Explanation: