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      Question

      Which of the following is not a valid HTTP response

      status code category?
      A 2xx β€” Success Correct Answer Incorrect Answer
      B 3xx β€” Redirection Correct Answer Incorrect Answer
      C 4xx β€” Client Error Correct Answer Incorrect Answer
      D 5xx β€” Server Error Correct Answer Incorrect Answer
      E 6xx β€” Network Error Correct Answer Incorrect Answer

      Solution

      HTTP status codes are grouped as: 1xx (Informational), 2xx (Success β€” e.g., 200 OK), 3xx (Redirection β€” e.g., 301 Moved Permanently), 4xx (Client Error β€” e.g., 404 Not Found, 403 Forbidden), 5xx (Server Error β€” e.g., 500 Internal Server Error, 503 Service Unavailable). There is no 6xx category. Common banking context: 401 Unauthorized, 429 Too Many Requests (rate limiting for API security).

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