Refer to the exhibit.

Originally, all four switches had the same region configuration. VLAN 14 was added to Switch_D and then mapped to instance 2.

How does this affect the MSTP topology?

A. Load sharing is lost, one of the uplinks is blocked for all traffic on Switch_C and Switch_D.

B. Load sharing is lost, one of the uplinks is blocked for all traffic on Switch_D

C. All connectivity is lost, both uplinks are blocked on Switch_D.
D. A Layer 2 loop exists and will cause sporadic connectivity issues.