what channels are considered non-overlapping?

In an 802.11b/g system, what channels are considered non-overlapping? (Choose two)

A.
Channels 5 and 10

B.
Channels 1 and 5

C.
Channels 3 and 7

D.
Channels 2 and 8

E.
Channels 8 and 11

F.
Channels 10 and 13