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

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.