Refer to the exhibit. Which description of the event captured in the SIP message between a Cisco Unified Communication Manager Express router and Cisco Unity Express is true?
A. The MWI notification can be destined only to a SCCP IP phone
B. The MWI notification method used is subscribe-notify
C. The MWI notification can be destined only to a SIP IP phone
D. The MWI notification method used is outcall
E. The MWI notification method used is unsolicited