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.common.datatransfer; /** * Contains a list of students and instructors in a course. Useful for caching * a copy of student and instructor details of a course instead of reading * them from the database multiple times. */ public class CourseRoster { private final Map<String, StudentAttributes> studentListByEmail = new HashMap<>(); private final Map<String, InstructorAttributes> instructorListByEmail = new HashMap<>(); private final Map<String, List<StudentAttributes>> teamToMembersTable; public CourseRoster(List<StudentAttributes> students, List<InstructorAttributes> instructors) { populateStudentListByEmail(students); populateInstructorListByEmail(instructors); teamToMembersTable = buildTeamToMembersTable(getStudents()); } public List<StudentAttributes> getStudents() { return new ArrayList<>(studentListByEmail.values()); } public List<InstructorAttributes> getInstructors() { return new ArrayList<>(instructorListByEmail.values()); } public Map<String, List<StudentAttributes>> getTeamToMembersTable() { return teamToMembersTable; } /** * Checks whether a student is in course. */ public boolean isStudentInCourse(String studentEmail) { return studentListByEmail.containsKey(studentEmail); } /** * Checks whether a team is in course. */ public boolean isTeamInCourse(String teamName) { return teamToMembersTable.containsKey(teamName); } /** * Checks whether a student is in team. */ public boolean isStudentInTeam(String studentEmail, String targetTeamName) { StudentAttributes student = studentListByEmail.get(studentEmail); return student != null && student.getTeam().equals(targetTeamName); } /** * Checks whether two students are in the same team. */ public boolean isStudentsInSameTeam(String studentEmail1, String studentEmail2) { StudentAttributes student1 = studentListByEmail.get(studentEmail1); StudentAttributes student2 = studentListByEmail.get(studentEmail2); return student1 != null && student2 != null && student1.getTeam() != null && student1.getTeam().equals(student2.getTeam()); } /** * Returns the student object for the given email. */ public StudentAttributes getStudentForEmail(String email) { return studentListByEmail.get(email); } /** * Returns the instructor object for the given email. */ public InstructorAttributes getInstructorForEmail(String email) { return instructorListByEmail.get(email); } private void populateStudentListByEmail(List<StudentAttributes> students) { if (students == null) { return; } for (StudentAttributes s : students) { studentListByEmail.put(s.getEmail(), s); } } private void populateInstructorListByEmail(List<InstructorAttributes> instructors) { if (instructors == null) { return; } for (InstructorAttributes i : instructors) { instructorListByEmail.put(i.getEmail(), i); } } /** * Builds a Map from team name to team members. */ public static Map<String, List<StudentAttributes>> buildTeamToMembersTable(List<StudentAttribut
Assistant: