Which type of defensive operation concentrates on denying enemy forces access to designated terrain for a specific time instead of destroying the enemy outright?

The correct choice emphasizes the concept of control and timing in defensive operations. An area defense is designed to protect specific terrain features or a designated area, focusing primarily on denying enemy forces access to that area rather than aiming to destroy them outright. The objective is to maintain control over the terrain for a specific duration, allowing friendly forces to prepare for future actions or reinforce other positions.

Unlike the other concepts, area defense includes the flexibility to withdraw or reposition forces as necessary while preventing the enemy from gaining foothold or exploiting the terrain's advantages. It is a more strategic approach aimed at using time as a weapon to delay, disrupt, or shape the enemy’s operations. This type of defensive operation is often utilized in situations where the commander recognizes the importance of holding key terrain even when an immediate counterattack or destruction of the enemy is not feasible or preferable.