Final answer:
A vehicle log's purpose is to document the usage, maintenance, and inspection history of a vehicle, supporting its safety, efficiency, and compliance with regulations.
Step-by-step explanation:
The purpose of a vehicle log is indeed D. All of the above. A vehicle log serves multiple functions, which include recording when a vehicle is taken out and brought back, keeping track of maintenance issues, and keeping a record of inspections. Detailed documentation in a vehicle log is critical for ensuring the safety, operational efficiency, and longevity of the vehicle. It also helps in managing costs related to vehicle maintenance and repair, as well as ensuring compliance with regulatory requirements.