Elance Exams Answers PDF file

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You've created an XMLHttpRequest object, xhr, and properly called open as well as send on the object. When you check xhr.status and it's 0 and your responseText is null. What's the most likely explanation of what happened?

The request has not yet connected to the server.
Your request was canceled either due to a failed connection or a user action.
The target resource was served from the browser's cache.
The server encountered an unknown error.
The browser has initiated too many simultaneous XHR requests and this request has been queued.
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