What hierarchy should be recommended?

A small restaurant franchise wants to implement Marketing Cloud to support their franchise owners. The owners of franchised stores add a customized local message to the marketing campaign.

What hierarchy should be recommended?
A . One parent business unit and a child business unit for franchise owners.
B . One parent business unit and a child business unit for each franchise owners
C . One business unit.
D . A parent business unit for each franchise owner

Answer: A