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.