The correct answer is D. it makes data requests asynchronously.
AJAX stands for Asynchronous JavaScript and XML. It is a technique used to make web pages more interactive by loading data from a server without reloading the entire page. This is done by using JavaScript to make a request to the server, and then using the response to update the page without reloading it.
AJAX is unique because it allows web pages to be updated without reloading the entire page. This makes web pages more interactive and user-friendly.
Option A is incorrect because AJAX is not a stand-alone web development tool. It is a technique that can be used with any web development tool.
Option B is incorrect because AJAX does not work the same with all web browsers. Some web browsers support AJAX better than others.
Option C is incorrect because AJAX does not use c++ as its programming language. AJAX can be implemented using any programming language that supports JavaScript.