The correct answer is A) With an azimuthing thruster the prime mover is located inside the hull, and with a podded propulsor the prime mover is located outside the hull. This is the fundamental difference between these two propulsion systems. In an azimuthing thruster, the prime mover (such as an engine or electric motor) is located inside the hull, and the thruster unit that provides propulsion and steering is located outside the hull. In contrast, with a podded propulsor, the prime mover is located outside the hull, typically in a streamlined pod that also houses the propeller or other propulsion device. The other answer choices do not accurately describe the key distinction between these two propulsion systems.