Which two benefits does Cisco Unified IM and Presence Service bring to businesses? (Choose two.)
A. enhances productivity by using availability awareness and reduce communications delays
B. provides Enterprise IM capabilities, such as persistent chat, group chat, and IM history
C. provides and streamlines enterprise audio and video communications
D. enhances communications by providing multipoint conference capabilities
E. supports standard-based XMPP clients by supporting native SIP/SIMPLE and H.323 protocols
