Final answer:
The 3 key concerns when guarding interactive play structures are safety, accessibility, and maintenance.
Step-by-step explanation:
The 3 key concerns when guarding interactive play structures are safety, accessibility, and maintenance. Safety is important to ensure that children can play without the risk of injuries. Accessibility ensures that the play structures are inclusive and can be enjoyed by children of different abilities. Maintenance is necessary to keep the structures in good condition and prevent any hazards.