Which of the following should the administrator configure to achieve the application requirements with the LEAST cost?

An IaaS application has a two-hour RTO and a four-hour RPO. The application takes one hour to back up its data or restore from a local backup file. A systems administrator is tasked with configuring the backup policy.

Which of the following should the administrator configure to achieve the application requirements with the LEAST cost?
A . Back up to long-term storage every night
B . Back up to object storage every three hours
C . Back up to long-term storage every four hours
D . Back up to object storage every hour

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Answer: D