Explanation:
If an Amazon RDS instance runs out of storage space, it goes into a STORAGE_FULL state. When an instance is in this state, automated backups cannot be created because the instance cannot be frozen or perform the underlying I/O operations required for snapshot creation. Amazon S3 storage is virtually unlimited and managed by AWS for automated backups, so it doesn't get 'full' (Option A). Multi-AZ is not required (Option C), and a 7-day retention period is perfectly valid (Option D).
A SysOps administrator needs to ensure that an Amazon RDS for PostgreSQL DB instance has available backups. The DB instance has automated backups turned on with a backup retention period of 7 days. However, no automated backups for the DB instance have been created in the past month.
What could be the cause of the lack of automated backups?
A
The Amazon S3 bucket that stores the backups is full.
B
The DB instance is in the STORAGE_FULL state.
C
The DB instance is not configured for Multi-AZ.
D
The backup retention period must be 30 days.
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