Final answer:
The Duty Officer is responsible for conducting muster and inspection when side boys must gather at 1200 on the quarterdeck.
Step-by-step explanation:
When side boys must gather for muster and inspection at 1200 on the quarterdeck, the responsibility falls on the Duty Officer, who is in charge of overseeing and maintaining discipline on board a ship. The Duty Officer ensures that all crew members are present and properly dressed, and conducts inspections to verify that everyone complies with regulations and standards.
The Executive Officer is the second-in-command on a ship and is responsible for assisting the commanding officer. While they may be involved in inspections, it is typically the duty of the Duty Officer. The Chief Petty Officer is a senior enlisted member who provides leadership and guidance to the enlisted crew, but they do not have the specific responsibility of conducting muster and inspection. The Ship's Cook is responsible for cooking and providing meals on the ship and would not be involved in muster and inspection activities.