Which two options describe MSTP? (Choose two.)

Which two options describe MSTP? (Choose two.)

A.
MSTP allows multiple root bridges per MSTI.

B.
MSTP supports up to 64 MSTIs per region.

C.
MSTP uses the CST to be backwards compatible with STP and RSTP.

D.
MSTP provides quicker convergence than STP and RSTP.