You need to design an administrative model that meets the business and technical requirements. What should you do？（）

• A、Assign permissions to manage Mailbox and Exchange Server configuration to the server-admins group
• B、Assign permissions to manage Mailbox and Exchange Server configuration to the domain-admins group
• C、Assign permissions to manage Mailboxes to the server-admins group. Assign permissions to manage Exchange Servers configuration to the domain-admins group
• D、Assign permissions to manage Mailboxes to the domain-admins group. Assign permissions to manage Exchange Servers configuration to the server-admins group