Which statement about non-overlapping channels is true?

Which statement about non-overlapping channels is true?

A.
Non-overlapping channels share the same frequencies to improve roaming.

B.
Non-overlapping channels use different frequency bands to improve roaming.

C.
Non-overlapping channels share the same frequencies but use different modulations to avoid
interference.

D.
Non-overlapping channels use the same frequency band but use non-shared frequencies to
avoid interference