Which wireless technology is limited to operate in a frequency range with only three nonoverlapping channels?

A.
802.1a

B.
802.1x

C.
802.1ad

D.
802.11g

Explanation:
802.11b (and 802.11g) networks offer 11 channels, but only three channels (1, 6, and 11) do not
overlap with each other. In a large-scale building or campus-wide installation, the ability to use
only three channels can reduce real-world throughput and make avoiding interference from other
802.11b or 802.11g-based wireless networks difficult.