When parking the vehicle, if the driver has to leave the driver's seat, they must...

When parking the vehicle, if the driver has to leave the driver's seat, they must...
A)Take the necessary precautions to prevent the use of the vehicle without authorization.Correct
B)Leave it properly chocked.
C)Leave the gearshift in the parking position.
Before leaving the driver's seat we must:
- Stop the engine and disconnect the starting system. If you move away from the vehicle, prevent its use without authorization.
- Engage the parking brake.
- If the immobilization is on a slope, we must:
- Engage the appropriate gear, first gear on an upward slope, and reverse on a downward slope, or, where applicable, the parking position.

Vehicle combinations, buses, and vehicles with a MAM of more than 3,500 kg must be properly chocked:
- by resting one of the steering wheels against the curb, turning them towards the center of the road on upward slopes and outwards on downward slopes, or
- by placing appropriate chocks, without being able to use stones or other elements not intended for that function. The chocks must be removed before starting to drive.