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From the perspectives of regulatory compliance and incident response, which measure is most appropriate to ensure that audit trails for IoT data are reliably preserved?
①Audit logs are retained only for a short period and automatically deleted once they become outdated.
②Store logs on each device in a distributed manner and do not centralize them.
③Record operations with CloudTrail and CloudWatch, store them in S3, and monitor them using S3 Object Lock and the destination SIEM.
④There is no need to record logs for audit purposes; logs will be collected only when a problem occurs.
⑤Logs are stored unencrypted in a public S3 for fast access.