Which of the following is a common pool safety rule that should be enforced?

Enforcing the rule regarding no running or diving in designated shallow areas is vital for pool safety. This rule helps prevent injuries, particularly head and spine injuries, that can occur from diving into shallow water. It is essential to inform patrons that running around the pool can lead to slips and falls, while diving in shallow areas can result in serious accidents. These types of injuries can have long-lasting effects, so emphasizing this guideline not only promotes safe behavior but also creates a more secure environment for all swimmers.

The other options do not align as closely with widely accepted safety standards. Requiring floaties for all swimmers may not be necessary and can encourage dependency on floatation devices, which might give a false sense of security. Allowing outside food and drink can lead to cleanliness issues and hazards, while banning swimming at night might not address the potential risks associated with swim safety measures like lifeguard availability and proper lighting.