Refer to the network exhibit.

The network shown in the exhibit is comprised of four MSTP regions that are interconnected
Based on this topology, which statement is true?

A.
PVST should be used instead of MSTP

B.
A routing solution must be used between MSTP regions when more than one region exists

C.
An optimized topology can be created using MSTP between the regions

D.
The switches are running the equivalent of RSTP between the regions

Explanation: