Which role group should you assign each team?

Explanation/Reference:
Explanation:
Discovery Management: Administrators or users who are members of the Discovery Management role group can perform searches of mailboxes in the Exchange organization for data that meets specific criteria and can also configure litigation holds on mailboxes.
Records Management: Users who are members of the Records Management role group can configure compliance features, such as retention policy tags, message classifications, transport rules, and more.
Recipient Management: Administrators who are members of the Recipient Management role group have administrative access to create or modify Exchange 2013 recipients within the Exchange 2013 organization.
Help Desk: Users who are members of the Help Desk role group can perform limited recipient management of Exchange 2013 recipients. The Help Desk role group, by default, enables members to view and modify the Outlook Web App options of any user in the organization. These options might include modifying the user’s display name, address, phone number, and so on. They don’t include options that aren’t available in Outlook Web App options, such as modifying the size of a mailbox or configuring the mailbox database on which a mailbox is located.
Organization Management: Administrators who are members of the Organization Management role group have administrative access to the entire Exchange 2013 organization and can perform almost any task against any Exchange 2013 object, with some exceptions. Of the groups listed, the Organization Management group is the only that can create and manage security groups.
References:
https://technet.microsoft.com/en-us/library/dd638105(v=exchg.150).aspx