I am new to database , i am having a small assignment in my cource .The assignment is

Assume you are the DBA of a large international banking concern (sites in three countries). You have just taken over the position and found that there is currently no roles used in the database. What roles do you need to create? Consider job function, location, and any other criteria you can identify.

They are asking the role alone not the code in oracle , so please help me what are the possible roles in bank can be created