Refer to the exhibit. How many servers are seeded in the GAB port membership?

A.
The GAB port membership has two nodes: 01 and 12.

B.
The GAB port membership has four nodes: 0, 1, 21, and 22.

C.
The GAB port membership has three nodes: 0, 1, and 12.

D.
The GAB port membership has three nodes: 0, 1, and 21.