Which Configuration on Cisco Unified Communications Manager Is Required for SIP

Which configuration on Cisco Unified Communications Manager is required for SIP MWI to work?

A) The line partition must be inside the inbound CSS assigned to the CUC SIP trunk.
B) The line partition must be inside the rerouting CSS assigned to the Cisco Unity Connection SIP trunk.
C) Set the "Enable message waiting indicator" on the port group.
D) Assign a MWI extension on the mailbox.