Buoys which only mark the left or right side of the channel will never exhibit a light with which characteristic?

Correct Answer: Option B — Composite group flashing

Lateral buoys marking channel sides use specific light rhythms to convey information. Composite group flashing is reserved for special marks or specific navigational hazards, not for simple lateral channel marking. Standard lateral buoys utilize flashing, quick flashing, or isophase rhythms to define the channel boundaries for mariners.