Which rule must be followed regarding the use of starting blocks?

The correct choice emphasizes that starting blocks should only be used for specified programming, such as Lifetime Programming, which is designed to ensure safety and proper instruction. This rule is in place to safeguard swimmers by ensuring that they are using the equipment under appropriate circumstances, usually with guidance from trained staff. Starting blocks can present various risks, such as slipping or misuse, particularly if unaided individuals are allowed to use them without guidance or during unsupervised times.

Allowing untrained individuals to use starting blocks could lead to accidents, which is why supervision is crucial. Also, when starting blocks are designated for specific programming, it helps to control the environment in which they are used, making it much easier to manage safety protocols, provide instruction, and create a standardized environment for practice or competition.

In contrast, the other choices do not adequately prioritize safety protocols or acknowledge the structured environment necessary for using starting blocks effectively. This ensures a focus on safety, learning, and appropriate use in a controlled setting.