A Cisco Unified Communications solution is being deployed as follows:

includes Cisco Unified Presence
integrates with Microsoft Office Communications Server
used for remote call control of Cisco Unified IP phones

What must be taken into consideration for scalability?

A.
the hardware platform being used by Cisco Unified Presence

B.
the hardware platform being used by Cisco Unified Communications

C.
the type of Cisco Unified IP Phone being controlled

D.
the version of Microsoft Office Communicator