What is a valid 40 MHz channel configuration in the 2.4 GHz ISM band where channels 1-11 are permitted?
(Choose 2)

A.
4 (primary), +1 (secondary)

B.
4 (primary), -1 (secondary)

C.
8 (primary), +1 (secondary)

D.
1 (primary), 6 (secondary)

E.
11 (primary), 6 (secondary)

F.
1 (primary), 5 (secondary)