A network engineer is designing a wireless network that uses multiple access point for complete coverage.
Which of the following channel selections would result in the LEAST amount of interference between each
access point?

A.
Adjacent access point should be assigned channels 1, 6, and 11 with a 20MHz channel width.

B.
Adjacent access points should be assigned channels 2,6, and 10 with a 20MHz channel width.

C.
Adjacent access points should be assigned channels 7 and 11 with a 40MHz channel width.

D.
Adjacent access points should be assigned channels 8 and 11 with a 40MHz channel width.

Explanation:
http://www.windowsnetworking.com/articles-tutorials/wireless-networking/tips-assigning-wi-fi-channels.html