How could the Marketing Cloud admin ensure distinct data integrity across the regions?

Security and legal teams determine subscriber data available to EMEA teams should NOT be available to AMER teams.

How could the Marketing Cloud admin ensure distinct data integrity across the regions?
A . Deploy Multi-Org with a single Marketing Cloud Account
B . Deploy separate Publication Lists for each region within one account
C . Filter data view permissions at the subscriber level
D . Separate regions into business units and apply Subscriber Filters

Answer: D