What does "reefing" a sail mean, and roughly when might a skipper decide to do it?

A. Reefing means removing a sail completely and stowing it below decks

B. Reefing reduces the effective area of a sail that's exposed to the wind, typically done as wind strength increases, to keep the boat manageable, reduce heel, and reduce strain on the rig and crew — a sensible skipper reefs earlier rather than later, since it's far easier and safer to reef in moderate conditions than to wait until it's genuinely blowing hard

C. Reefing only applies to the mainsail, never to a headsail

D. Reefing is a manoeuvre used exclusively when returning to harbour

A. Nothing — a test lift can proceed immediately after repairs

B. Testing should wait until cargo operations begin

C. The area within the grab's swing radius should be cleared of personnel before the lift

D. Only the crane operator needs to be aware the lift is happening

A. Who must remain clear of the exclusion zone while the lift takes place

B. The lunch schedule for the deck team

C. Only the weather forecast for the next watch

D. The cargo manifest for the next port