Which of the following web browser features allows users to open and switch between multiple web pages within a single application window? MCQ with Answer and Explanation

Explanation:
React, Angular, and Vue.js are all popular JavaScript frameworks/libraries for building front-end user interfaces.

Explanation:
XMLHttpRequest is an API in JavaScript that allows web pages to make HTTP requests to servers asynchronously, enabling AJAX.

Explanation:
POP3 (Post Office Protocol version 3) retrieves emails by downloading them to a local client device and typically deleting them from the mail server data storage.