An IaaS application has a two-hour RTO and 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? 

Answer options:

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.

D