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单项选择题 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.

  • B

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