Multiple Spanning Tree (MST) is an IEEE standard inspired from the Cisco proprietary Multiple Instances Spanning Tree Protocol (MISTP) implementation. Which three statements about the Multiple Spanning Tree (MST) protocol (IEEE 802.1s) are true? (Choose three.)

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

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

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

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