Which three items are configured in MST configuration submode? (Select three)

A.
Region name

B.
Configuration revision number

C.
VLAN instance map

D.
IST STP BPDU hello timer

E.
CST instance map

F.
PVST+ instance map

Explanation:
spanning-tree mst configuration:
Use the spanning-tree mst configuration command to enter the MST configuration submode. Use
the no form of this command to return to the default MST configuration.
Defaults:
The default value for the MST configuration is the default value for all its parameters:
Usage Guidelines:
The MST configuration consists of three main parameters: