Which of the following about the SSM protocol are true?

Which of the following about the SSM protocol are true?
A . After the SSM protocol is disabled, the clock network can be unidirectional but cannot adopt a ring topology.
B . After the standard SSM protocol is enabled, the clock network can be bidirectional but cannot adopt a ring topology.
C . After the extended SSM protocol is enabled, the clock network can be bidirectional and adopt a ring topology, which can be intersecting or tangent with other networks.
D . The SSM protocol has little to do with clock networks.

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Answer: AB