When a user attempts to access a resource on an application but is unauthorized due to the application's lack of correct authentication credentials, which HTTP status code should the application return to the user's browser?
400 Bad Request
500 Internal Server Error
401 Unauthorized
404 Not Found
The correct answer is 401 Unauthorized. This status code indicates that the request has not been applied because it lacks valid authentication credentials for the target resource. The other codes listed are incorrect because 404 implies that a resource is not found, 400 indicates a bad request from the client that the server could not process, and 500 signifies an internal server error, none of which are appropriate responses for an authentication issue.
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