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What does the XMLHttpRequest object accomplish in Ajax?

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Question:
What does the XMLHttpRequest object accomplish in Ajax?

Option A):
It provides the ability to mark up and style the display of Web-page text
Option B):
It provides the ability to asynchronously exchange data between Web browsers and a Web server.
Option C):
It's the programming language used to develop Ajax applications.
Option D):
It provides a means of exchanging structured data between the Web server and client.

Correct Answer is Option B):
It provides the ability to asynchronously exchange data between Web browsers and a Web server.