In a network running STP, multiple topology change informations are sent when the network topology changes. How many kinds of topology change informations are defined in the RSTP network?

In a network running STP, multiple topology change informations are sent when the network topology changes. How many kinds of topology change informations are defined in the RSTP network?
A . One kind
B . Two kinds
C . Three kinds
D . Four kinds

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Answer: A