When are file pool policy actions applied to files?

A.
When a file is written for path-based filters after SmartPools job has run at least once

B.
When a file is read for node pool location-based actions after the SmartPools job has run
at least once

C.
When the SetProtectPlus job runs for clusters with multiple file pool policies

D.
When a file is modified for the first time after the SetProtectPlus job has run at least once