What Is the Main Benefit of Using a Stair Chair

What is the main benefit of using a stair chair with a track-like system over a traditional stair chair?

A) A stair chair with a track-like system can be manipulated to lift into an ambulance using a hydraulic system.
B) A stair chair with a track-like system prevents the patient from having to be lifted down stairs.
C) There is no benefit of a track-like stair chair over a traditional stair chair.
D) Only one EMT is required to operate a stair chair with a track-like system.