Refer to the exhibit.

The topology shown in this exhibit implements Multiple Spanning Tree Protocol (MSTP), where all the switches
are in the same region.
How many MSTP instances, besides the Internal Spanning Tree (IST) or instance 0, does this network need in
order to have effective load sharing on the uplinks from the access switches?

A.
two

B.
three

C.
four

D.
five