which action occurs to signal a high availability failover to neighboring switches?

For an SRX chassis cluster in transparent mode, which action occurs to signal a high
availability failover to neighboring switches?

A.
the SRX chassis cluster generates Spanning Tree messages

B.
the SRX chassis cluster generates gratuitous ARPs

C.
the SRX chassis cluster flaps the former active interfaces

D.
the SRX chassis cluster uses IP address monitoring