[单选]
Refer to the exhibit. STP has been implemented in the network. Switch SW_A is the root switch for the default VLAN. To reduce the broadcast domain， the network administrator decides to split users on the network into VLAN 2 and VLAN 10. The administrator issues the command spanning-tree vlan 2 root primary on switch SW_A.
What will happen as a result of this change？（）

A . All ports of the root switch SW_A will remain in forwarding mode throughout the reconvergence of the spanning tree domain.
B . Switch SW_A will change its spanning tree priority to become root for VLAN 2 only.
C . Switch SW_A will remain root for the default VLAN and will become root for VLAN 2.
D . No other switch in the network will be able to become root as long as switch SW_A is up and running.

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Refer to the exhibit. STP has been implemented in the network. Switch SW_A is the root switch for the default VLAN. To reduce the broadcast domain， the network administrator decides to split users on the network into VLAN 2 and VLAN 10. The administrator issues the command spanning-tree vlan 2 root primary on switch SW_A.
What will happen as a result of this change？（）

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