To achieve a kill, what must a weapon do?

The correct choice is centered around the concept of the kill chain, which refers to the series of steps or phases that a military operation must successfully complete to effectively engage and eliminate a target. Each phase of the kill chain is critical to ensure success in an operation, including target identification, tracking, engagement, and assessment of results.

By performing successfully at each phase of the kill chain, a weapon system ensures that it can effectively locate, track, and engage its target. This comprehensive approach is crucial in modern warfare, where precision and integration of various assets and systems play a significant role in operational effectiveness. Failure to execute any phase could lead to mission failure, making it imperative that all stages are completed successfully in order to achieve a kill.

In contrast, the other options focus on specific tactics or capabilities that, while potentially beneficial in certain circumstances, do not encompass the holistic process required for a successful engagement as outlined in the kill chain framework.