Which two of the following statements are true about VPIM? (Choose two)
A. VPIM is used to exchange email messages between different voice-mail systems.
B. voice-mail systems that are using VPIM must have unique extensions.
C. VPIM must use a location ID for each voice-mail system.
D. VPIM must be used when internetworking Cisco Unity Connection and Cisco Unity Express.
E. VPIM users cannot be regular voice-mail users.
F. VPIM message use a similar format to SIP SDP messages, as defined in RFC 3281.
