During an emergency brake application, what should be done with the independent brake handle?

In the event of an emergency brake application, placing the independent brake handle in the application zone without sliding the wheels is important for maintaining control of the train. This action allows for effective braking without causing the wheels to lock up, which can lead to a loss of traction or even derailment. It ensures that the train slows down in a controlled manner, enabling the crew to react appropriately to the situation while also protecting the integrity of the train's system. The emphasis on avoiding wheel sliding is crucial, as it can lead to increased wear on the brakes and wheels, as well as a potentially dangerous situation if the train cannot come to a stop safely.

This practice aligns with safe operational procedures that prioritize both the immediate situation and long-term equipment maintenance. The other options do not facilitate the controlled braking necessary during an emergency.