A network administrator needs to deploy seven equally spaced WAPs along an underground tunnel.
Which of the following is the BEST channel design to avoid interference?

A.
1,3,5,7,9,11,1

B.
1,6,11,1,1,6,11

C.
1,11,1,11,1,11,1

D.
11,1,6,11,1,6,11