What happens when an aircraft door is in the disarmed mode?

When an aircraft door is in the disarmed mode, the escape slide is in a state where it does not deploy automatically. This is a critical safety feature, as the disarmed mode is used when the aircraft is on the ground and preparing for boarding or deplaning. In this mode, the crew can open the door safely without the risk of the slide deploying and potentially causing injury or mishap.

This mode allows the cabin crew to manage the boarding process and ensure passenger safety without the automatic deployment of the slide, which is designed for emergency evacuations when the aircraft is in flight or in emergency situations. Therefore, option B accurately describes the functionality of an aircraft door in the disarmed mode, helping to maintain safety procedures during ground operations.