To release type A and self-releasing type B safeties, what initial action is required?

To release type A and self-releasing type B safeties, the initial action required is to move the car upward with one short upward move. This action is crucial as it ensures that the safeties are disengaged appropriately. When the elevator car is moved upward slightly, it allows the mechanisms of the safeties to reset, facilitating a safe and smooth operation of the elevator system afterward.

In the context of elevator safety, moving the car upward helps disengage the brakes that are activated by the safeties in response to abnormal conditions, such as an overspeed or an obstruction. This careful procedure maintains the integrity of the safety systems while allowing for the normal functionality of the elevator.

Other options may not engage the safety systems effectively or may compromise safety protocols. Therefore, the action of moving the car upward with a brief motion is essential in reestablishing normal operational conditions while adhering to established safety practices.