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?

Channels 3, 5, 7, and 9 overlap with the non-overlapping channels (1, 6, 11), introducing adjacent-channel interference throughout the tunnel.

Positions 4 and 5 are both assigned channel 1, placing two adjacent WAPs on the same channel and causing direct co-channel interference.

Using only channels 1 and 11 leaves channel 6 unused; in a seven-WAP linear layout this forces at least two WAPs within range to share the same channel, increasing co-channel interference compared to rotating all three.

Channels 1, 6, and 11 are the only non-overlapping channels in the 2.4 GHz band. The pattern 11, 1, 6, 11, 1, 6, 11 rotates through all three so that every adjacent pair of WAPs uses a different, non-overlapping channel, minimizing co-channel and adjacent-channel interference across all seven access points.