Final answer:
Tech A is correct about lifting the vehicle by turning the jack handle counterclockwise, and Tech B is correct about lowering the vehicle by turning the jack handle clockwise.
Step-by-step explanation:
Tech A states that when lifting and securing a vehicle with a vehicle jack and jack stands, to lift the vehicle, one should slowly turn the jack handle counterclockwise. Tech B states that to lower the vehicle, one should slowly turn the jack handle clockwise. Both Tech A and Tech B are correct.
When lifting the vehicle, turning the jack handle counterclockwise increases the pressure inside the hydraulic jack, which raises the vehicle. On the other hand, when lowering the vehicle, turning the jack handle clockwise reduces the pressure inside the hydraulic jack, allowing the vehicle to lower down.
Therefore, Tech A is correct about lifting the vehicle by turning the jack handle counterclockwise, and Tech B is correct about lowering the vehicle by turning the jack handle clockwise.