What is the duration of validity for vehicle registrations in Guam?

The correct answer indicates that vehicle registrations in Guam are valid for a duration of one year, or annually. This means that vehicle owners are required to renew their registration every year to maintain compliance with local laws. Keeping vehicle registrations up to date is crucial for legal operation on public roads, and it also helps in ensuring that vehicles are properly insured and inspected as required.

The annual registration period allows for efficient tracking of vehicle status and ensures that vehicle owners are consistently reminded of their obligations regarding vehicle maintenance and insurance. This structure helps to reduce complications for both the owners and the authorities in managing vehicle compliance and records.

In contrast, other options suggest different timeframes that do not align with the established regulation in Guam. For instance, a monthly or biannual registration would require much more frequent renewals, which could lead to administrative burdens for both the agency and vehicle owners. A biennial registration would extend the time between renewals to two years, which is not in line with Guam's regulations for vehicle registrations.