What indicates that flight attendants may disarm and cross check their doors?

The indication for flight attendants to disarm and cross check their doors is typically signaled by the seatbelt light being turned off. This event signifies that the aircraft is no longer in a phase of flight where the potential for turbulence is high, making it safe for the cabin crew to stand and move around the cabin. Disarming the doors is a critical safety procedure that allows for the opening of the doors once the aircraft lands and comes to a complete stop. It's important for flight attendants to wait for this signal to ensure both their safety and that of the passengers, as they prepare for the next steps in their service duties.

The other options relate to different phases of flight or actions taken by the flight crew but do not accurately reflect the specific procedural signal for door disarmament.