Regarding Account Teams, what is the purpose of marking a role as 'unique'?

Regarding Account Teams, what is the purpose of marking a role as ‘unique’?

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Regarding Account Teams, what is the purpose of marking a role as ‘unique’?
A . The role then becomes a child responsibility
B. Ensure there is a dedicated account manager for that account
C. The role then becomes a parent responsibility
D. Prevent the same role being used on different customer accounts

Answer: A