The correct answer is D) Upon a normal cycling or safety shutdown, the fuel control solenoid valve coil under test closes with no visible leakage into the burner(s). This is the correct answer because according to 46 CFR regulations, the fuel supply control solenoids must be checked to ensure that they properly shut off the fuel supply during a normal cycling or safety shutdown. Specifically, the regulations require that the solenoid valve physically closes and seals to prevent any leakage of fuel into the burner(s), which could create a safety hazard. Options A, B, and C do not fully address this key requirement of no visible leakage after the solenoid valve has closed.