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What should be used to request and update data in the background?
Correct Answer: A
> "AJAX (Asynchronous JavaScript and XML) is a technique used in web development to send and retrieve data from a server asynchronously, without interfering with the display and behavior of the existing page." > This enables dynamic updates of web content without a full page reload. References: * MDN Web Docs: AJAX Introduction * W3C: XMLHttpRequest API ---