Which extension involves covering a young driver under a main policy?

The relevant extension that involves covering a young driver under a main policy is the option that refers to an additional premium for named drivers. This approach allows insurers to include young or inexperienced drivers in an existing policy by adding them as named drivers, usually at an increased cost. Young drivers often pose a higher risk due to their lack of experience, leading insurers to charge an additional premium to mitigate this risk.

This practice provides a legal and formal way to cover young drivers while ensuring that the insurance policyholder is aware of the potential increase in their premium. It positively impacts risk assessment and allows families or individuals to include younger drivers in a straightforward manner under their main motor insurance policy.

Other options, while related to insurance practices, do not directly address the extension for covering a young driver under a main policy, focusing instead on different concepts within insurance coverage.