I might not be doing this right

Which of these would best describe 802.11b?

A) Operates at 54 Mbit/s

B) Operates at 5 GHz and/or 2.4 GHz

C) Operates exclusively at 5 GHz

D) Operates at a maximum of 11 megabits per second

E) Backwards compatible with 802.11a

F) My wireless cord isn’t long enough