Which type of guidance is used by the AIM-120 missile?

The AIM-120 missile utilizes a semi-active and active guidance system, which allows it to engage targets with high precision. This dual method enhances the missile's effectiveness in various combat situations.

In the semi-active guidance phase, the missile relies on radar from the launching aircraft to illuminate the target. The missile uses this reflected radar energy to home in on its target. As the missile progresses toward the target, it transitions into the active phase, where it activates its internal radar to track and guide itself independently for the final approach. This combination of guidance methods allows for increased flexibility and adaptability during interception, providing the capability to engage targets autonomously once it is away from the launching platform.

The other options represent different guidance methodologies that do not apply to the AIM-120, making the selection of semi-active/active guidance the most accurate choice for this missile's operational characteristics.