What should you do to check the parking brake?

To check the parking brake, putting the vehicle in gear while the parking brake is engaged is an effective method. This action allows you to determine whether the parking brake is functioning properly. If the parking brake is effective, the vehicle will remain immobilized when in gear, indicating that it is holding the vehicle securely. If the vehicle moves despite being in gear, this suggests that the parking brake is not working correctly and needs to be inspected or adjusted.

The other options would either pose safety risks or not provide an accurate assessment of the parking brake's functionality. Pressing the accelerator sharply with the parking brake engaged could lead to unnecessary wear on the brake system and is dangerous. Engaging the parking brake while driving at low speeds compromises safety and does not accurately test the brake’s effectiveness.