Which statement about Cisco Unified Communications Manager Express and Cisco Unified Communications Manager is correct?

A.
Cisco Unified Communications Manager Express is router-based and Cisco Unified Communications Manager scales up to 240 users.

B.
Cisco Unified Communications Manager is router-based and scales up to 24000 users.

C.
Cisco Unified Communications Manager is server-based and scales up to 24000 users.

D.
Cisco Unified Communications Manager Express is router-based and Cisco Unified Communications Manager scales up to 30000 users.

E.
Cisco Unified Communications Manager is server-based and Cisco Unified Communications Manager Express scales up to 300 users.