Which two of the following statements are true about VPIM? (Choose two)

VPIM is designed specifically to transport voice messages (MIME-encoded audio) between voice-mail systems using SMTP as a carrier - the messages are voice mail, not generic email messages.

VPIM does not require unique extensions across interconnected systems; it uses location IDs to differentiate voice-mail deployments, meaning extension numbers can overlap between separate systems.

VPIM requires a unique location ID configured for each voice-mail system so that messages can be correctly addressed and routed to the destination server - without a location ID, VPIM cannot identify the target voice-mail system.

VPIM is the supported and required protocol for exchanging voice messages when internetworking Cisco Unity Connection and Cisco Unity Express, as these are two distinct voice-mail platforms that cannot share a native directory.

There is no restriction preventing a VPIM contact from also being a regular local voice-mail subscriber; a mailbox can serve both roles simultaneously.

VPIM messages use MIME/SMTP format as defined in RFC 3801 and RFC 3802, not SIP SDP format; RFC 3281 defines Attribute Certificates in the Internet PKI and has no relation to VPIM.