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In a real-time defense system, which measure is appropriate to suppress malicious attempts from high-frequency inputs while maintaining legitimate use?
①Reduce latency by allowing all requests unconditionally.
②Decrypt and publish the input contents externally.
③Outsource the critical parts of the system to an external service.
④Combine rate limiting with anomaly detection to block suspicious behavior.
⑤Make tracking impossible by leaving no logs at all.