What type of area must be coordinated before fire can be delivered while also ensuring unit safety?

The correct answer is Restrictive Fire Area. A Restrictive Fire Area (RFA) is a designated portion of airspace where fire support may be delivered, but specific restrictions or limitations must be in place to ensure the safety of friendly forces and non-combatants. Coordination is essential in an RFA to ensure that all units involved are aware of these restrictions and can operate within the parameters set to minimize risk.

In contrast, a No Fire Area (NFA) is completely off-limits to fire support, meaning no fire can occur in that area at all. A Free Fire Area (FFA) allows for fire support to be delivered without restriction on friendly forces within that area, indicating less concern for unit safety in that particular zone. A Kill Box is a specific type of airspace designed for the engagement of targets where friendly forces can operate safely, but it doesn't emphasize the same restrictions as an RFA, making it less concerned with coordination for unit safety.

Thus, the need for coordination in a situation where unit safety is a priority directly aligns with the characteristics of a Restrictive Fire Area.