MSTP is also called multiple spanning tree protocol. What problems can be solved in a single spanning tree network through MSTP? (Multiple Choice)

MSTP is also called multiple spanning tree protocol. What problems can be solved in a single spanning tree network through MSTP? (Multiple Choice)
A . Part of the Vlan path is inaccessible.
B . Unable to use traffic sharing.
C . Suboptimal Layer 2 path.
D . Improve business reliability.

Answer: ABC