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When you put objects in Amazon S3, what is the indication that an object was successfully stored?

A HTTP 200 result code and MD5 checksum, taken together, indicate that the operation was successful.

Amazon S3 is engineered for 99.999999999% durability. Therefore there is no need to confirm that data
was inserted.

A success code is inserted into the S3 object metadata.

Each S3 account has a special bucket named _s3_logs. Success codes are written to this bucket with a
timestamp and checksum.

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