To have the ultimate authority for a mobile offshore drilling unit while it is under tow, a rig mover must __________.

Correct Answer: Option A — hold an endorsement as Offshore Installation Manager and be held as the person in charge of the rig

46 CFR 109.105 mandates that the person in charge of a MODU during transit or tow must hold an OIM endorsement. This ensures that the individual responsible for the unit's stability and safety during the high-risk evolution of towing possesses the requisite USCG-validated knowledge and professional certification.