A customer purchases nine OceanStor 9000 storage nodes. During the deployment planning, the customer requires that data integrity be not affected if any three disks in a storage node are faulty, and the overall storage space utilization be not lower than 80%.
Which of the following is the most proper redundancy ratio?
A . 8+1
B . 6+3
C . 6+3: 1
D . 16 +3: 1
Answer: D