What will the fan-out ratio be?

Throughput from each server is 6400KB/s. Average I/O size is 8KB. Each FA port can support
4000 IOPS. The write ratio is low and customer does not want to exceed 80% utilization of the FA
ports. What will the fan-out ratio be?

A.
8

B.
12

C.
4

D.
6