Which of the following is a key component of a lightweight anti-armor weapon?

A key component of a lightweight anti-armor weapon is indeed the free flight, fin-stabilized rocket type cartridge. This feature is critical because it enhances the accuracy and effectiveness of the weapon when engaging armored targets. The fins help stabilize the rocket in flight, maintaining a straight trajectory, which is essential for hitting fast-moving or distant targets. Additionally, the free flight capability ensures that the projectile can travel in a direct line towards the target without the need for extensive guidance systems, making it simpler and more reliable in various combat situations.

While recoil mitigation systems and computerized targeting systems are important in modern weaponry, they are not universally associated with lightweight anti-armor weapons. Explosive reactive armor, on the other hand, is a defensive measure used on vehicles to protect against incoming projectiles, rather than a component of the weapon itself. Thus, the unique characteristics of the free flight, fin-stabilized rocket type cartridge specifically align it with the functionality and design of lightweight anti-armor weapons.