Which exception handling method checks for user input?

Mandatory Field Validation is the correct choice because it specifically addresses the need to ensure that user inputs meet certain criteria before being processed. This method evaluates whether required fields have been filled out by the user, helping to prevent errors or incomplete submissions in an application. By enforcing this validation, the application can improve its reliability and user experience, as it provides immediate feedback when users neglect to provide necessary information.

In contrast, Handler Flows typically manage exceptions that occur within the application but are not solely focused on user input. Global Context Checking is more concerned with the overall state of the application or the user's session rather than individual data fields. Role Verification is designed to confirm that users have appropriate permissions or access rights, which, while essential for security, does not directly relate to the correctness of user input. Thus, Mandatory Field Validation stands out as the sole method dedicated specifically to checking user input.