Correct Answer:
Explanation/Reference:
Admin1 must be the global admin that will grant him/her access to all administrative features. Global admins are the only admins who can assign other admin roles. You can have morethan one global admin in your organization. The person who signs up to purchase Office 365 becomes a global admin.
Admin2 must be the billing admin to enable him/her to make purchases, manage subscriptions, and monitor service health.
Admin 3 must be theUser Management admin to allow him/her to reset passwords, monitor service health, and manage user accounts, user groups, and service requests. The user management admin can’t delete a global admin, create other admin roles, or reset passwords for billing,global, and service admins.
References:
https://support.office.com/en-IN/article/assigning-admin-roles-d58b8089-cbfd-41ec-b64c-9cfcbef495ac
http://onlinehelp.microsoft.com/en-in/office365-enterprises/gg243432.aspx#bkmk_EditProfile