Which method does a Cisco unified 9971 Phone use to send keep-alive messages to Cisco unified Communications manager?

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Which method does a Cisco unified 9971 Phone use to send keep-alive messages to Cisco unified Communications manager?
A. Sccp StationServerReq
B. SIP Notify with events set to keep-alive
C. SIP register with expires set to zero
D. Sccp stationregister
E. SIP options

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