Which two applications must be connected to a leaf cluster in a Cisco Unified Communications Manager Session Management Edition deployment?

Which two applications must be connected to a leaf cluster in a Cisco Unified Communications
Manager Session Management Edition deployment? (Choose two.)

A.
Cisco Unified Meeting Place

B.
Cisco Unified Contact Center Express

C.
H.323-based video conferencing systems

D.
Cisco Unity

E.
Cisco Unified Communications Manager Attendant Console

F.
fax servers