How do you secure a parked automatic-transmission vehicle (except for a vehicle with a robotic gearbox)?

Why this is the answer

The correct answer in the official bank: Shift into parking gear (P) and secure the parking brake.

In an automatic transmission, the parking position P mechanically locks the drive wheels so the vehicle cannot roll. Applying the parking brake adds a second layer of security and takes strain off the lock, especially on a slope. Neutral leaves the wheels free, and first or reverse gear are not meant for securing a parked automatic, unlike a manual gearbox.

Topic: Safety. The bank marks it for these classes: Light truck (C1), Private car (B).