Domain Controllers

Your manager has asked you, one of his most technical employees, to decide which of the 10 new 2016 servers will have a FSMO role, and to explain
the function of these 5 roles to him. He has asked that there be a single forest with a parent domain of UMUC.edu and one subdomain of
cnas.UMUC.edu. Based on that setup, where would you place the ten domain controllers on the network, and which ones would have FSMO roles?
Keep in mind that there are multiple correct answers to this question.