In the network as shown in the figure, all switches run the RSTP protocol. If the E1 interface of SWB failure, the RSTP process is? (Multiple choices)

A . SWB deletes the port list that use E1 as the destination port in the MAC address table.
B . Recalculate the spanning tree and elect E2 as the new root port.
C . Topology change notification is sent out on all forwarding ports to inform other switch networks that a topology change has occurred.
D . Topology change notification is sent out on all non-edge forwarding ports to inform other switch networks that a topology change has occurred.

Answer: ABD