When multiple events occur simultaneously, how does the system determine which handler to execute first?

The selection of which event handler to execute first when multiple events occur simultaneously is based on the order in which the events were triggered. This is important because it ensures that the system processes events logically and maintains the intended flow of execution.

When an event is triggered, it is added to an event queue, and handlers are typically executed in the order that they arrive in that queue. This mechanism helps keep the system's behavior predictable and allows developers to reason about the sequence in which actions will occur. For instance, if multiple user interactions happen at nearly the same time, processing them in the order they were triggered allows for consistency in how the application responds.

Additionally, the other options do not align with standard event-handling practices. Random selection would lead to unpredictable behavior, prioritizing events could lead to neglecting less important triggers, and executing handlers in reverse order could create confusion regarding the state of the application after multiple events have transpired. Thus, the correct approach is to process the handlers of the first triggered events first.