Amazon S3 Standard is the correct option for this scenario because it provides immediate access with no retrieval fees and it does not impose a minimum storage duration which makes it suitable for logs retained for only 18 hours.

Amazon S3 Standard keeps objects immediately available so analytics jobs can read data without retrieval delay. It does not carry minimum retention charges so you can delete objects within hours without extra cost. You can also apply a lifecycle rule to automatically remove objects after the short retention window to control spend when the number and size of logs are unpredictable.

Amazon S3 Intelligent-Tiering is not ideal because it incurs per object monitoring and automation charges and its archive tiers have minimum storage durations which reduce cost effectiveness for data that exists only for hours.

Amazon S3 Glacier Deep Archive is intended for long term archival and it has long retrieval delays and retrieval fees which make it impractical for daily analytics that require fast access.

Amazon S3 One Zone-Infrequent Access (S3 One Zone-IA) is unsuitable because it carries a 30 day minimum storage duration and retrieval fees which would waste cost when objects are deleted within hours.

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