What action must be taken if a high-power rocket is to be launched?

The necessary action when launching a high-power rocket is to announce and countdown before launching. This practice is crucial for several reasons. A well-communicated countdown provides everyone involved with a clear understanding of when the launch will occur, which helps ensure that all participants are prepared and in safe positions. It serves as an important safety protocol, allowing any last-minute checks to be made and giving time for any potential issues to be addressed.

By having a countdown, both the launch team and spectators can maintain awareness of the imminent launch, reducing the risk of accidents. It also aligns with standard launch protocols used in rocketry, promoting a culture of safety and responsibility. This step ensures that everyone involved, including spectators, is ready and out of the way in time for the launch, contributing to a safe event overall.

Other actions, though important in their own contexts, do not prioritize the immediate safety and readiness of the launch team and spectators in the same way or offer the structured communication that a countdown does.