Which of the following is NOT a function of monitors in the system?

Monitors in a control system are primarily designed to observe and respond to specific conditions or events within that system. Their main functions include triggering actions based on certain conditions (for example, if a temperature sensor exceeds a preset level, a monitor can trigger a cooling system) and detecting whether specific conditions have been met.

The choice that states "To store user-defined states" is not a function of monitors. Monitors do not retain states; instead, they actively track and respond to real-time data and changes within the environment. Storing configurations or settings is typically managed by different components of the system, such as memory or configuration management tools, rather than by monitors themselves.

In addition, monitors contribute to simplifying command execution by providing immediate feedback on the state of the system, thus allowing users to make informed decisions about control actions. However, the essence of their role is not to save user-defined states but rather to continuously assess current conditions and trigger responses accordingly.