A. When the storage system is faulty, the time difference between the production site and the DR site may be 45 minutes.

B. The duration from the time when a fault occurs to the time when the service is suspended to the time when the service is recovered may be 45 minutes.

C. When the storage system is faulty, the time difference between the production site and the DR site may be 30 minutes.

D. The period from the time when a fault occurs to the time when the service is suspended to the time when the service is recovered may be 15 minutes.