What defines the lifecycle of a User Session?

The lifecycle of a User Session is best defined by the process of starting with access to the application and ending with a logout or timeout. When a user initiates a session, they are typically authenticated and granted access to the system, which marks the beginning of the session. This session remains active as long as the user is interacting with the application. It can end through a deliberate action, such as logging out, or through a timeout due to inactivity, which is a common security measure in web applications. This definition encompasses both the arrival of the user to the application and the mechanisms that signify the conclusion of their session, ensuring a clear understanding of user interaction.

The other options do not encapsulate the full user session lifecycle as effectively. While some may mention elements of session initiation and closure, they miss crucial aspects such as the role of logout and session expiration in defining when a session officially ends.