Which statement best describes the back-up line's role?

• A. It is used to drain water away from the fire scene.
• B. It is used to replace a failed primary line on the same nozzle.
• C. It is used only as a standby line that is never deployed.
• D. It is intended to relieve the primary line or provide water to a second point of attack.

Answer: (D)

The back-up line is there to support the initial attack by relieving the primary line or by delivering water to a second point of attack. This keeps the firefighting effort ongoing even if the first line becomes stretched, loses pressure, or needs repositioning, and it allows firefighters to attack the fire from another location without waiting for a new supply. It’s an active, supportive role that ensures water remains on the fire as tactics shift, rather than a line that only sits idle or is used to drain water away.