When you put objects in Amazon 53, what is the indication that an object was successfully stored?

When you put objects in Amazon 53, what is the indication that an object was successfully stored?
A . A HTIP 200 result code and MDS checksum, taken together, indicate that the operation was successful.
B . Amazon 53 is engineered for 99.999999999% durability. Therefore there is no need to confirm that data was inserted.
C . A success code is inserted into the 53 object metadata.
D . Each 53 account has a special bucket named _s3_1ogs. Success codes are written to this bucket with a timestamp and checksum.

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Answer: A