What is a quantum simulator?

Question: What is a quantum simulator? A) A classical or specialized system that mathematically simulates quantum circuits or quantum systems B) A device that always removes noise from real hardware C) A measurement result from one shot D) A rule that prevents entanglement Correct: A Explanation: A quantum simulator models quantum states and circuits without necessarily using real quantum hardware. Simulators are useful for testing circuits, but large quantum systems become expensive to simulate classically. Topic: quantum computing / simulators