Refer to the exhibit. Based on the output of the show spanning-tree command, which statement is true? ()
- A、Switch SW1 has been configured with the spanning-tree vlan 1 root primary global configuration command.
- B、Switch SW1 has been configured with the spanning-tree vlan 1 root secondary global configuration command.
- C、Switch SW1 has been configured with the spanning-tree vlan 1 priority 24577 global configuration command.
- D、Switch SW1 has been configured with the spanning-tree vlan 1 hello-time 2 global configuration command.
- E、The root bridge has been configured with the spanning-tree vlan 1 root secondary global configuration command.
正确答案:B
答案解析:有

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