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.util; /** * Represents the deployment-specific configuration values of the system. * This can be used to access values in the build.properties file too. */ public final class Config { /** The value of the "app.id" in build.properties file. */ public static final String APP_ID; /** The value of the "app.region" in build.properties file. */ public static final String APP_REGION; /** The value of the "app.version" in build.properties file. */ public static final String APP_VERSION; /** The value of the "app.frontend.url" in build.properties file. */ public static final String APP_FRONTEND_URL; /** The value of the "app.production.gcs.bucketname" in build.properties file. */ public static final String PRODUCTION_GCS_BUCKETNAME; /** The value of the "app.backup.gcs.bucketname" in build.properties file. */ public static final String BACKUP_GCS_BUCKETNAME; /** The value of the "app.csrf.key" in build.properties file. */ public static final String CSRF_KEY; /** The value of the "app.backdoor.key" in build.properties file. */ public static final String BACKDOOR_KEY; /** The value of the "app.encryption.key" in build.properties file. */ public static final String ENCRYPTION_KEY; /** The value of the "app.auth.type" in build.properties file. */ public static final String AUTH_TYPE; /** The value of the "app.oauth2.client.id" in build.properties file. */ public static final String OAUTH2_CLIENT_ID; /** The value of the "app.oauth2.client.secret" in build.properties file. */ public static final String OAUTH2_CLIENT_SECRET; /** The value of the "app.captcha.secretkey" in build.properties file. */ public static final String CAPTCHA_SECRET_KEY; /** The value of the "app.admins" in build.properties file. */ public static final List<String> APP_ADMINS; /** The value of the "app.maintainers" in build.properties file. */ public static final List<String> APP_MAINTAINERS; /** The value of the "app.crashreport.email" in build.properties file. */ public static final String SUPPORT_EMAIL; /** The value of the "app.email.senderemail" in build.properties file. */ public static final String EMAIL_SENDEREMAIL; /** The value of the "app.email.sendername" in build.properties file. */ public static final String EMAIL_SENDERNAME; /** The value of the "app.email.replyto" in build.properties file. */ public static final String EMAIL_REPLYTO; /** The value of the "app.email.service" in build.properties file. */ public static final String EMAIL_SERVICE; /** The value of the "app.sendgrid.apikey" in build.properties file. */ public static final String SENDGRID_APIKEY; /** The value of the "app.mailgun.apikey" in build.properties file. */ public static final String MAILGUN_APIKEY; /** The value of the "app.mailgun.domainname" in build.properties file. */ public static final String MAILGUN_DOMAINNAME; /** The value of the "app.mailjet.apikey" in build.properties file. */ publ
Assistant: