Your customer developed a preliminary Bill of Materials for a Cisco Unity voice-mail-only installation for their two locations. They will create a new forest/domain (VM.com) and use off-box Exchange message stores. Their Bill of Materials shows two Exchange servers and two Cisco Unity servers. They plan on using the domain controllers/global catalog servers in their existing domain for authentication.What do you tell the customer?

A.
Cross-box authentication must be enabled on the Cisco Unity server.

B.
The Bill of Materials is accurate.

C.
A domain controller/global catalog is needed in VM.com

D.
The customer should use on-box Exchange message store.