Your network contains an Active Directory forest named contoso.com. The forest contains two child domains named north.contoso.com and south.contoso.com. You plan to prepare Active Directory for a new Microsoft Exchange Server 2019 organization. All the domains will host user accounts for the Exchange mailboxes. An administrator runs Exchange Setup on a domain controller in the forest. You need to ensure that the forest is fully prepared for Exchange. What should you verify in the child domains?