Which of the following describes the primary fire boundaries?

The primary fire boundaries are crucial in fire protection and safety protocols on ships. They are defined as the surfaces that need to be sealed or resistant to fire spread to contain the fire within specific areas, thereby protecting other areas of the vessel.

The correct choice encompasses the Forward (FWD), Aft (AFT), Port, Starboard (STBD), as well as both the Top and Bottom of the affected space. This comprehensive approach ensures that all potential pathways for fire spread are accounted for, which is essential for effectively containing a fire within a compartment. By considering these six boundaries, it allows for a thorough understanding of the space in question, which is vital for firefighting efforts and ensuring crew safety.

Identifying the boundaries in this way helps to maintain integrity during firefighting operations, as crews rely on these defined limits to effectively isolate and combat fires without risking further spread to other parts of the vessel.

In contrast, other options either lack specificity about the boundaries needed to contain a fire effectively or do not account for both the top and bottom limits of the affected area, which are essential to establishing a complete fire boundary.