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單項(xiàng)選擇題

While logged into a Company switch you issue the following command：  
CompanySwitch（config-mst）# instance 10 vlan 11-12  
What does this command accomplish？（）

A. It enables a PVST+ instance of 10 for vlan 11 and vlan 12
B. It enables vlan 11 and vlan 12 to be part of the MST region 10
C. It maps vlan 11 and vlan 12 to the MST instance of 10.
D. It creates an Internal Spanning Tree （IST） instance of 10 for vlan 11 and vlan 12  
E. It create a Common Spanning Tree （CST） instance of 10 for vlan 11 and vlan 12
F. It starts two instances of MST， one instance for vlan 11 and another instance for vlan 12.

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