Which valve procedure is correct?
O A. Leave the valve protection cap in place until you are ready to withdraw gas from the cylinder
O B. Place the cylinder so that the valve handle is at the top and easily accessible
O C. Stand with the cylinder between you and the regulator, with the cylinder valve facing away from you
O D. Back off the pressure-adjusting screw of the regulator to release spring force
O E. All the choices are correct