A user has enabled automated backup for an RDS instance. What is the longest duration for which the user can retain
the automated backup?

A.
25 days

B.
15 days

C.
45 days

D.
35 days

Explanation:
Amazon RDS provides two different methods for backing up and restoring the Amazon DB instances: automated backups
and DB snapshots. Automated backups automatically back up the DB instance during a specific, user-definable backup
window, and keep the backups for a limited, user-specified period of time. The maximum period can be 35 days.
http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Overview.BackingUpAndRestoringAmazonRDSInstances.
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