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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; /** * Provides means to handle, manipulate, and convert JSON objects to/from strings. */ public final class JsonUtils { private JsonUtils() { // utility class } /** * This creates a Gson object that can handle the Date format we use in the * Json file and also reformat the Json string in pretty-print format. */ private static Gson getGsonInstance(boolean prettyPrint) { GsonBuilder builder = new GsonBuilder() .registerTypeAdapter(Instant.class, new InstantAdapter()) .registerTypeAdapter(ZoneId.class, new ZoneIdAdapter()) .registerTypeAdapter(Duration.class, new DurationMinutesAdapter()) .registerTypeAdapter(FeedbackQuestionDetails.class, new FeedbackQuestionDetailsAdapter()) .registerTypeAdapter(FeedbackResponseDetails.class, new FeedbackResponseDetailsAdapter()) .registerTypeAdapter(LogDetails.class, new LogDetailsAdapter()) .disableHtmlEscaping(); if (prettyPrint) { builder.setPrettyPrinting(); } return builder.create(); } /** * Serializes and pretty-prints the specified object into its equivalent JSON string. * * @see Gson#toJson(Object, Type) */ public static String toJson(Object src, Type typeOfSrc) { return getGsonInstance(true).toJson(src, typeOfSrc); } /** * Serializes and pretty-prints the specified object into its equivalent JSON string. * * @see Gson#toJson(Object) */ public static String toJson(Object src) { return getGsonInstance(true).toJson(src); } /** * Serializes the specified object into its equivalent JSON string. * * @see Gson#toJson(Object) */ public static String toCompactJson(Object src) { return getGsonInstance(false).toJson(src); } /** * Serializes the specified object into its equivalent JSON string and stream into a writer. * This is done to reduce the memory consumption when creating object across call stack. * * @see Gson#toJson(Object, Appendable) */ public static void toCompactJson(Object src, Appendable writer) { getGsonInstance(false).toJson(src, writer); } /** * Deserializes the specified JSON string into an object of the specified type. * * @see Gson#fromJson(String, Type) */ public static <T> T fromJson(String json, Type typeOfT) { return getGsonInstance(false).fromJson(json, typeOfT); } /** * Deserializes the specified JSON string into an object of the specified class. * * @see Gson#fromJson(String, Class) */ public static <T> T fromJson(String json, Class<T> classOfT) { return getGsonInstance(false).fromJson(json, classOfT); } /** * Parses the specified JSON string into a {@link JsonElement} object. * * @see JsonParser#parseString(String) */ public static JsonElement parse(String json) { return JsonParser.parseString(json); } private static class InstantAdapter implements JsonSerializer<Instant>, JsonDeserializer<Instant> { @Override public JsonElement serialize(Instant instant, Type type, JsonSerializationContext context) { synchronized (this) { return new JsonPrimitive(DateTimeFormatter.ISO_I
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