When comparing PBX architectures to Cisco Unified Communications, which two statements are true? (Choose two.) Select exactly 2 answer(s) from the following:

A.
A PBX will offer increased security.

B.
Cisco Unified Communications will always offer more enhanced telephony features.

C.
A PBX architecture will offer applications like presence and seamless video.

D.
Cisco Unified Communications will increase productivity.

E.
Cisco Unified Communications has historically provided customers with a migration path for upgrades and growth.