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.storage.entity; /** * An association class that represents the association Account --> * [enrolled in] --> Course. */ @Entity @Index public class CourseStudent extends BaseEntity { /** * ID of the student. * * @see #generateId(String, String) */ @Id private String id; @Translate(InstantTranslatorFactory.class) private Instant createdAt; @Translate(InstantTranslatorFactory.class) private Instant updatedAt; private transient String registrationKey; /** * The student's Google ID. Links to the Account object. * This can be null if the student hasn't joined the course yet. */ private String googleId; private String email; private String courseId; @Unindex private String name; @Unindex private String comments; private String teamName; private String sectionName; @SuppressWarnings("unused") private CourseStudent() { // required by Objectify } public CourseStudent(String email, String name, String googleId, String comments, String courseId, String teamName, String sectionName) { setEmail(email); setName(name); setGoogleId(googleId); setComments(comments); setCourseId(courseId); setTeamName(teamName); setSectionName(sectionName); setCreatedAt(Instant.now()); this.id = generateId(getEmail(), getCourseId()); setRegistrationKey(generateRegistrationKey()); } /** * Generates an unique ID for the student. */ public static String generateId(String email, String courseId) { return email + '%' + courseId; } public Instant getCreatedAt() { return createdAt; } /** * Sets the createdAt timestamp. */ public void setCreatedAt(Instant created) { this.createdAt = created; setLastUpdate(created); } public Instant getUpdatedAt() { return updatedAt; } public void setLastUpdate(Instant updatedAt) { this.updatedAt = updatedAt; } public String getUniqueId() { return this.id; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email.trim(); } public String getGoogleId() { return googleId; } public void setGoogleId(String googleId) { this.googleId = googleId == null ? null : googleId.trim(); } public String getName() { return name; } /** * Sets the full name of the student. */ public void setName(String name) { this.name = name.trim(); } public String getComments() { return comments; } public void setComments(String comments) { this.comments = comments == null ? null : comments.trim(); } public String getRegistrationKey() { return registrationKey; } public void setRegistrationKey(String registrationKey) { this.registrationKey = registrationKey; } public String getCourseId() { return courseId; } public void setCourseId(String courseId) { this.courseId = courseId.trim(); } public String getTeamName() { return teamName; } public void setTeamName(String teamName) { this.teamName = teamName == null ? null : teamName.trim(); } public String getSectionName() { return sectionName; } public void setSectionName(String sectionName) { this.secti
Assistant: