RSTP convergence speed is faster than STP. Which of the following statements are correct? (Multiple Choice)

RSTP convergence speed is faster than STP. Which of the following statements are correct? (Multiple Choice)
A . There is only one standard for detecting whether the topology changes in RST
B . A non-edge port migrates to the Forwarding state.
C . In STP, in order to avoid temporary loops, at least one forwarding delay must be waited. After all network port roles are determined, all ports can forward them.
D . The P/A negotiation process can continue to be passed downstream
E . Once the P/A negotiation is unsuccessful, the selection of the designated port needs to wait for two Forward delays. The negotiation process is the same as ST

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Answer: ABCD