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单选题
Which of the following will generate an RSTP topology change notification？（）
A
an edge port that transitions to the forwarding state
B
a non-edge port that transitions to the blocking state
C
a non-edge port that transitions to the forwarding state
D
an edge port that transitions to the blocking state
E
any port that transitions to the blocking state
F
any port that transitions to the forwarding state
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