Assistant: 
User: 
    Please analyze the following code file and determine whether it belongs to any of the provided modules based on the listed module descriptions.
    Note that the provided list of modules may not be exhaustive, and some files may not belong to any of the modules. 
    If the code belongs to a module, Only output the module name, without any explanation or additional information; otherwise, return 'None' if it does not belong to any module.

    Modules : {
        "UI": "Handles the front-end user interface, consisting of HTML, CSS, and JavaScript files generated by the Angular framework. It processes user requests and interacts with the server using AJAX for data retrieval and client-side interactions."
"Test Driver": "Facilitates automated regression testing and handles transmission of test data in JSON format. It performs Java testing using TestNG and JavaScript unit-testing with Jest. It also sets up a simulated web server for servlet-level tests and automates end-to-end testing using Selenium Java."
"Logic": "Manages the business logic of TEAMMATES, including handling relationships between entities, managing transactions, input value sanitization, access control rights, and interfacing with GAE-provided or third-party APIs."
"Storage": "Performs CRUD operations on data entities, validation of data, and abstraction of GQL queries, hiding the complexities of datastore from the Logic component."
"Common": "Contains utility classes, custom exceptions, and data transfer objects used across the entire application for easy consolidation and transfer of structured data."
"E2E": "Handles end-to-end testing and load & performance testing, providing helpers, abstractions of browser pages, and test cases for E2E tests and L&P tests."
"Client": "Contains scripts for administrative tasks, such as migrating data to a new schema and calculating statistics. This module connects directly to the application back-end for administrative purposes."
    }

    Code: package teammates.ui.webapi; /** * Deletes an instructor from a course, unless it's the last instructor in the course. */ class DeleteInstructorAction extends Action { @Override AuthType getMinAuthLevel() { return AuthType.LOGGED_IN; } @Override void checkSpecificAccessControl() throws UnauthorizedAccessException { //allow access to admins or instructor with modify permission if (userInfo.isAdmin) { return; } if (!userInfo.isInstructor) { throw new UnauthorizedAccessException("Admin or Instructor privilege is required to access this resource."); } String courseId = getNonNullRequestParamValue(Const.ParamsNames.COURSE_ID); InstructorAttributes instructor = logic.getInstructorForGoogleId(courseId, userInfo.id); gateKeeper.verifyAccessible( instructor, logic.getCourse(courseId), Const.InstructorPermissions.CAN_MODIFY_INSTRUCTOR); } @Override public JsonResult execute() throws InvalidOperationException { String instructorId = getRequestParamValue(Const.ParamsNames.INSTRUCTOR_ID); String instructorEmail = getRequestParamValue(Const.ParamsNames.INSTRUCTOR_EMAIL); String courseId = getNonNullRequestParamValue(Const.ParamsNames.COURSE_ID); InstructorAttributes instructor; if (instructorId != null) { instructor = logic.getInstructorForGoogleId(courseId, instructorId); } else if (instructorEmail != null) { instructor = logic.getInstructorForEmail(courseId, instructorEmail); } else { throw new InvalidHttpParameterException("Instructor to delete not specified"); } if (instructor == null) { return new JsonResult("Instructor is successfully deleted."); } // Deleting last instructor from the course is not allowed (even by admins) if (!hasAlternativeInstructor(courseId, instructor.getEmail())) { throw new InvalidOperationException( "The instructor you are trying to delete is the last instructor in the course. " + "Deleting the last instructor from the course is not allowed."); } logic.deleteInstructorCascade(courseId, instructor.getEmail()); return new JsonResult("Instructor is successfully deleted."); } /** * Returns true if there is at least one joined instructor (other than the instructor to delete) * with the privilege of modifying instructors and at least one instructor visible to the students. * * @param courseId Id of the course * @param instructorToDeleteEmail Email of the instructor who is being deleted */ private boolean hasAlternativeInstructor(String courseId, String instructorToDeleteEmail) { List<InstructorAttributes> instructors = logic.getInstructorsForCourse(courseId); boolean hasAlternativeModifyInstructor = false; boolean hasAlternativeVisibleInstructor = false; for (InstructorAttributes instr : instructors) { hasAlternativeModifyInstructor = hasAlternativeModifyInstructor || instr.isRegistered() && !instr.getEmail().equals(instructorToDeleteEmail) && instr.isAllowedForPrivilege(Const.InstructorPermissions.CAN_MODIFY_INSTRUCTOR); hasAlternativeVisibleInstruc
Assistant: