Which three statements about the Multiple Spanning Tree (MST) protocol (IEEE 802.1s) are true?
(Choose three.)

A.
All switches in an MST region, except distribution layer switches, should have their priority
lowered from the default value 32768.

B.
To verify the MST configuration, the show pending command can be used in MST configuration
mode.

C.
Enabling MST with the spanning-tree modemst global configuration command also enables
RSTP.

D.
All switches in the same MST region must have the same VLAN-to-instance mapping, but
different configuration revision numbers.

E.
An MST region is a group of MST switches that appear as a single virtual bridge to adjacent
CST and MST regions.

F.
When RSTP and MSTP are configured,UplinkFast and BackboneFast must also be enabled.