Which of the following is an example of administrative control?

Setting schedules to minimize heat exposure is an example of administrative control because it involves managing how work tasks are organized and performed to reduce the risk of heat-related illnesses. Administrative controls focus on changing work practices and policies to improve safety and health in the workplace. By scheduling tasks during cooler times or ensuring that there are adequate breaks, the potential for heat stress is significantly decreased, thereby protecting workers' health.

Other options like installing containment barriers or requiring personal protective equipment are more focused on physical or engineering controls, while providing safety training sessions relates to education on risks and safe practices but does not directly modify work processes or schedules.