Which term denotes the manual action that precedes arming to prepare the system?

• A. Enable
• B. Direct ignition
• C. Fire
• D. Enable button

Answer: (D)

In this sequence, the manual action that starts the readiness before arming is pressing an explicit control labeled to enable the system. The term that best captures that action is the enable button because it names the physical control you actively manipulate to put the system into a ready state prior to arming. It’s a concrete action distinct from the broader idea of enabling (which can be a state) and from actions that occur after arming, like firing. The other terms describe different parts of the process: enable by itself isn’t specific to the control, direct ignition skips the pre-arm step, and fire happens after arming. The enable button precisely denotes the preparatory manual action.