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.