Which protocol does the Cisco Jabber client use, in conjunction with Cisco IM and Presence, to
deliver enterprise-class instant messaging services?

A.
SIP

B.
CTI/QBE

C.
XMPP

D.
IRC

E.
ICQ

Explanation:
Many federated IM networks communicate using an open standard, such as Jabber,
that leverages the Extensible Messaging and Presence Protocol (XMPP). Networks using
XMPP provide open communications with other XMPP-based networks.