Which statement is true about RSTP topology changes?

Which statement is true about RSTP topology changes?
A . Any change in the state of the port generates a TC BDPU
B . Only nonedge ports moving to the forwarding state generate a TC BDPU
C . If either an edge port or a nonedge port move to a block state, then a TC BDPU is generated
D . Only edge ports moving to the blocking state generate a TC BPDU
E . Any loss of connectivity generates a TC BDPU

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Answer: B