Which configuration step is necessary for a Cisco SIP phone to synchronize its time with a specific source?

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Which configuration step is necessary for a Cisco SIP phone to synchronize its time with a specific source?
A . Change the Time Zone from “America/Los_Angeles” to “Etc/GMT+8”.
B . Add a phone NTP Reference to the date/time Group.
C . Assign the device to the correct region.
D . Change the time format from 24-hour to 12-hour.

Answer: B