Which line indicates the type of mark used in the 9-Line CAS Brief?

The type of mark used in the 9-Line Close Air Support (CAS) briefing is indeed indicated by Line 7. This line specifies how the aircraft will identify the target on the ground, which is critical for ensuring that friendly forces are not engaged and that the airstrikes are effective. The information provided in Line 7 can include marking methods such as smoke, infrared markers, laser designators, or other visual indicators that signal the target to the aircraft. Understanding this line is essential for coordinating effective air support and enhancing situational awareness on the battlefield.