What is the minimum duration for which a vehicle inspection report must be retained?

The correct answer is 18 months, which aligns with regulations that require vehicle inspection reports to be retained for that specific duration. This retention period is critical as it ensures that there is a documented history of the vehicle's compliance with safety standards and any issues that were addressed during inspections. Keeping these reports for 18 months allows for proper tracking of vehicle safety metrics and is beneficial for both regulatory compliance and consumer rights. This timeframe provides a balance between the need for record-keeping and the practicality of managing documentation, especially considering that vehicles may go through multiple inspections over their lifetime.