AFFF hard hoses shall be inspected and hydrostatically tested every ___ years, and the service life must not exceed ___ years.

The correct information highlights that Aqueous Film Forming Foam (AFFF) hard hoses are required to undergo inspections and hydrostatic testing every three years to ensure their integrity and reliability in emergency situations. This regular testing helps to identify any potential weaknesses or failures in the hoses that could compromise their function during firefighting operations.

Additionally, the maximum service life of these hoses is set at 12 years. This limit is established to mitigate risks associated with aging materials, as their ability to withstand pressure and perform adequately can degrade over time. After reaching the 12-year mark, it is critical to replace the hoses to maintain safety and effectiveness in firefighting efforts.

In contrast, other options present different time frames that do not align with established safety guidelines, which prioritize regular testing and the timely replacement of essential equipment to ensure operational readiness.