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 . Add a Phone NTP Reference to the Date/Time Group.
B . Assign the device to the correct region.
C . Change the Time Format from 24-hour to 12-hour.
D . Change the Time Zone from “ America/Los_Angeles" to ” Etc/GMT+8".

Answer: A