Which statement about operating an attack line from a ground ladder is correct?

Operating an attack line from a ground ladder requires proper safety and operational procedures to ensure effective firefighting while minimizing risk. The statement that the hose must be secured to the ladder is correct because it is crucial for maintaining control of the hose while operating it from a height.

Securing the hose prevents it from slipping off the ladder during use, which could lead to loss of control and potentially dangerous situations for the firefighter and those below. This practice also aids in maintaining a clear pathway for the firefighter to maneuver the nozzle while directing water onto the fire.

In contrast, other practices such as allowing the hose to hang freely from the ladder could create complications, such as entanglement or increased weight leading to the potential loss of balance. Additionally, having only one person operate the line can limit the effectiveness of the attack, as it often requires teamwork to manage the hose and direct the water effectively, especially in challenging conditions. Finally, positioning the ladder at a 45-degree angle is not necessary for securing the hose and is more about ensuring the ladder's stability and reach rather than the safe operation of the attack line.