The storage on a Symmetrix VMAX is divided into four static tiers:
TierA contains RAID 5 (3+1) Enterprise Flash Drives (EFDs)
TierB contains 2-Way-Mir 15K RPM Fibre Channel drives

–TierC contains RAID 5 (7+1) 10K RPM Fibre Channel drives
TierD contains RAID 6 (6+2) SATA drives
Which is a valid FAST policy?

A.
10% TierA, 40% TierB, 20% TierC, 30% TierD

B.
10% TierA, 50% TierB, 20% TierC

C.
15% TierA, 50% TierB, 50% TierD

D.
20% TierA, 30% TierB, 30% TierC, 30% TierD