which two factors determine the root bridge in each region?

In MSTP, which two factors determine the root bridge in each region? (Choose two.)

A.
The switch with the higher priority becomes the root bridge.

B.
The switch with the lower priority becomes the root bridge.

C.
The switch with the lower MAC address becomes the root bridge when priorities are tied.

D.
The switch with the higher MAC address becomes the root bridge when priorities are tied.