What should a driver do to secure the towing vehicle before unhitching a trailer?

1. A.Disconnect the electrical supply to the trailer lights and lower the jockey wheel.
2. B.Lower the jockey wheel and then switch off the ignition.
3. C.Apply the handbrake, switch off the ignition and engage a low gear.
4. D.Apply the handbrake, lower the jockey wheel and switch off the engine.

This is an official-style question from the Managing Risk topic of the Ireland driver theory test (Cat. B). Practise all 807 questions free on iTest.ie — with timed mock exams, automatic mistake tracking and progress sync across devices.