In a VNX series array, how does FAST manage data in a heterogeneous storage pool?

A.
It relocates more active data to faster drives and less active data to slower drives.

B.
It relocates more active data from tier 1 storage without users noticing the difference.

C.
It acts as an application accelerator and relocates LUNs based on performance.

D.
It relocates LUNs from one tier to another to improve performance.