In which way does SyncE propagate the clocking information in synchronous mode over an Ethernet link?

In which way does SyncE propagate the clocking information in synchronous mode over an Ethernet link?
A . It encodes the clock information into IEEE 1588v2 packets
B . It uses the communication channel conveying the clock information that is called SSM
C . It uses dedicated ESMC frames that are sent at regular intervals
D . It uses Layer 2 multicast frames that are sent to 01:00:5E:00:01:01

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Answer: B