Identify one type of defensive operation.

The correct response is area defense, which is a specific type of defensive operation designed to defend or retain specific terrain while allowing the enemy to penetrate into the area. In an area defense, the primary objective is to create a situation where forces can concentrate their combat power against the enemy at decisive points, enhancing their ability to inflict maximum casualties and hold their position.

Area defense emphasizes the control of key terrain features, allowing friendly forces to leverage their strengths while minimizing exposure to the enemy. This can involve the establishment of strong points, the effective use of obstacles, and coordinated defensive fire plans. The main aim is to create conditions favorable for the counteroffensive action, should the situation necessitate it.

In contrast, other types offered in the options may not align as closely with the standard definitions outlined in military doctrine. While strategic defense references a broader concept that might include national or joint forces acting defensively, it does not pinpoint a specific method of operation like area defense. Similarly, warfare defense and combined defense do not represent established terms recognized universally within military doctrine and may refer to various tactics that do not define a clear category of defensive operation.