What type of offensive operation is focused on destroying enemy forces and securing terrain?

The focus of an offensive operation that aims at destroying enemy forces and securing terrain is best categorized as an attack. In this context, the term "attack" encompasses a range of military operations designed to engage the enemy directly, inflict damage, and take control of strategic locations.

An attack involves coordinated actions and maneuvers aimed at achieving specific objectives, such as disrupting the enemy's combat capabilities while also establishing control over important ground. In these operations, the primary goal is not only to defeat the enemy but also to occupy and hold the terrain that is critical for further military objectives.

Other types of operations, such as exploitation and deliberate attack, serve different purposes. Exploitation typically follows a successful attack, aimed at capitalizing on the ensuing chaos and pushing forward to achieve deeper penetration into enemy territory. A deliberate attack usually refers to a planned and organized operation that comes with a comprehensive understanding of the enemy's defenses, which may not necessarily focus on rapid movement but rather on the methodical seizure of terrain.

Overall, the type of operation that prioritizes both the destruction of enemy forces and the security of terrain is correctly identified as an attack.