Which HTTP code ranges refer to crawl errors? Choose two answers.

The 4xx range of HTTP status codes indicates client errors. This means the request sent by the crawler could not be fulfilled due to an issue on the client's (crawler's) side, such as a malformed request or a request for a non-existent page (404 Not Found). The 5xx range indicates server errors. These errors occur when the server fails to fulfill a valid request from the crawler, often due to issues like server overload or internal server errors (500 Internal Server Error). Both 4xx and 5xx codes prevent a page from being successfully crawled and indexed, thus representing crawl errors. The 2xx range indicates success, meaning the request was received, understood, and accepted. The 3xx range indicates redirection, meaning further action is needed to complete the request, but it's not an error.