Final answer:
If a major defect is detected during a vehicle inspection, it must be immediately repaired to ensure safety and compliance with vehicle regulations.
Step-by-step explanation:
When you detect and record a major defect on your daily inspection report, the correct action to take is B) Immediately repair it. This is necessary to ensure that the vehicle is safe to operate and to comply with vehicle regulations and safety standards. Operating a vehicle with a major defect can pose serious risks to the driver, passengers, and others on the road. Therefore, addressing the issue promptly is crucial.