11) What of the following statements is correct?

a) IEEE 802.11b operates at 5 GHz.
b) IEEE 802.11ac operates at 2.4 GHz.
c) IEEE 802.11a operates at 2.4 GHz.
d) IEEE 802.11n operates at 2.4 GHz.
e) IEEE 802.11g operates at 5 GHz.

c) IEEE 802.11a operates at 2.4 GHz.