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Which set of Amazon S3 features helps to prevent and recover from accidental data loss?

A.
Object lifecycle and service access logging

B.
Object versioning and Multi-factor authentication

C.
Access controls and server-side encryption

D.
Website hosting and Amazon S3 policies

Explanation:
Versioning-enabled buckets enable you to recover objects from accidental deletion or
overwrite
In addition to that, they have made it a requirement that delete operations on versioned data
can only be done using MFA (Multi factor authentication).
http://media.amazonwebservices.com/AWS_Security_Best_Practices.pdf

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