The correct answer is C. both rpo & rto.
RPO (recovery point objective) is the maximum amount of data that can be lost in a disaster. RTO (recovery time objective) is the maximum amount of time that can elapse before a system is restored after a disaster. Both RPO and RTO are important factors to consider when developing a backup strategy.
A low RPO means that the organization is willing to lose less data in a disaster. This can be achieved by backing up data more frequently. A low RTO means that the organization is willing to wait less time for a system to be restored after a disaster. This can be achieved by using a backup solution that can restore data quickly.
The specific RPO and RTO that an organization chooses will depend on the criticality of the data and systems that need to be backed up. For example, an organization that relies on its data for critical business operations will likely have a lower RPO and RTO than an organization that does not rely on its data as much.
In addition to RPO and RTO, there are other factors to consider when developing a backup strategy, such as the cost of the backup solution, the amount of data that needs to be backed up, and the frequency of backups.