Which of the following is NOT an event that an Event Handler might respond to?

An Event Handler is designed to respond to specific interactions or events that occur within a web application or software environment. Common examples of these events include user interactions such as button clicks, webpage loads, and data submissions. Each of these involves a state change or an action that the program needs to capture and respond to.

Conversely, a successful installation does not fall into the category of events that an Event Handler would typically monitor. The installation process is generally a system-level operation that occurs before the application is running, meaning that the application itself is not actively listening for or responding to events during this phase. Once the application is running, it can handle user-initiated events, but installation success is not something that an event-driven architecture typically addresses. Thus, it stands out as the correct answer in the context of what an Event Handler can or cannot respond to.