The correct answer is A) Tricing pendant. When pulling on line number 5 in illustration D012SA, the tricing pendant will be released. The tricing pendant is a line used to hoist and secure the lifeboat when it is not in use, keeping it lifted and away from the ship's side. Pulling on line 5 is the mechanism to release the tricing pendant and allow the lifeboat to be lowered into the water. The other options are incorrect because: B) Gripes are lines used to secure the lifeboat to the ship, C) Frapping lines are used to tighten the lashings on the lifeboat, and D) Releasing the lifeboat itself is a separate operation from releasing the tricing pendant.