The correct answer is C) Connect the common connection to hull ground first, then connect the phase connections to common. This is the correct procedure because it ensures that the equipment is properly grounded before any live electrical connections are made. Connecting the common to hull ground first establishes a safe ground path, which provides protection against electric shock or other hazards before the phase connections are made. This sequence helps to prevent accidental exposure to live electrical circuits during the setup process. The other options are incorrect because they either do not establish the ground connection first (B and D) or attempt to make all connections simultaneously (A), which increases the risk of electric shock or other safety issues.