1588V2 clock enters non-tracking working mode, and the alarm CLOCK_NO_TRACE_MODE is reported. What are the possible reasons? (Multiple choice)

1588V2 clock enters non-tracking working mode, and the alarm CLOCK_NO_TRACE_MODE is reported. What are the possible reasons? (Multiple choice)
A . Some nodes in the network start the SSM protocol and some do not start the SSM protocol
B . The original priority table of the system clock is not configured. The network element uses its own default priority table.
C . Clock source priority table other than the internal source is lost or the frequency deviation is too large.
D . PTP clock configuration error

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Answer: ABC