Which maneuver is used to engage an enemy while minimizing exposure?

Bounding Overwatch is the correct choice for engaging an enemy while minimizing exposure. This tactical movement involves two elements: one element advances while the other provides cover and security. The covering element observes and covers the advancing element, ensuring that they can move without being exposed to enemy fire for an extended time. This allows the unit to progress toward the enemy while maintaining a high level of safety, as each element can alternate their roles, effectively reducing the overall risk of exposure to enemy forces.

In contrast, the other options typically involve greater exposure. A flanking maneuver can indeed surprise the enemy but often requires moving around the enemy's position, which can expose troops to direct fire. A direct assault generally involves a frontal attack where soldiers are more vulnerable to enemy fire. An enveloping maneuver, while potentially effective, also necessitates maneuvering around the enemy and can lead to increased exposure as units seek to encircle the target. Bounding Overwatch, therefore, stands out as the best choice for minimizing exposure during engagement.