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Q7 Single choice

What is the difference between S3 authentication signature version 2 and S3 authentication signature version 4?

A
Version 2 uses a shared secret and access key ID
Version 4 uses the date/region algorithm
B
Version 2 uses HMAC algorithm
Version 4 uses the credentials scope algorithm
C
Version 2 uses a namespace based signature Version 4 uses HMAC algorithm
D
Version 2 uses the secret key to sign the request Version 4 uses a signing key

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