Which of the following response codes indicates that the server cannot find the requested resource?

The response code indicating that the server cannot find the requested resource is 404. This code is part of the HTTP status codes that clients receive from servers regarding the success or failure of a request. A 404 status specifically means that the server was unable to locate the resource that the client requested, which can occur for various reasons such as a typo in the URL or the resource being moved or deleted.

In contrast, the other response codes signify different outcomes. For instance, a 200 status code indicates that the request has succeeded and the server has returned the requested resource. A 201 status is used when a new resource has been successfully created as a result of a request, indicating success in a different context. A 500 status code, on the other hand, denotes an internal server error, which means that there was an unexpected condition encountered by the server that prevented it from fulfilling the request. Understanding these codes is crucial for diagnosing issues with web communication and services.