Refer to the network exhibit.

All of the switches in the exhibit are configured as follows:
• Config name = “Region!’
• Revision #= 1
• Instance 1=VLANs 10.12
• lnstance2 = VLANs11,13
• 1ST instance = VLANs 1-9.14-4094
Currently, onlyVLANs 1,10,11,12, and 13 exist on the four switches. A network administrator adds
VLAN 15 to Switch_C. How is the topology affected by this change?

A.
Spanning tree recalculates, with load sharing not in effect to Switch_C.

B.
Spanning tree recalculates, with load sharing still in effect to Switch_C.

C.
A loop now exits involving Switch_C.

D.
No topology changes occur with spanning tree.

Explanation: