Gabarito: E
A propriedade readyState conntém o status do XMLHttpRequest.
0: request not initialized
1: server connection established
2: request received
3: processing request
4: request finished and response is ready status 200: "OK"
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A propriedade onreadystatechange define uma função a ser executada quando o readyState for alterado.
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A propriedade status e a propriedade statusText mantém o status do objeto XMLHttpRequest.
status
403: "Forbidden"
404: "Page not found"
For a complete list go to the statusTextReturns the status-text (e.g. "OK" or "Not Found")
statusText retorna o status-text (e.g. "OK" or "Not Found")
Fonte: https://www.w3schools.com/xml/ajax_xmlhttprequest_response.asp