DRAG DROP
An organization has an on-premises Exchange organization that consists of two Active Directory forests in an account and resource forest configuration. The
resource forest hosts Exchange 2013. You plan to migrate to Exchange Online.
You need to prepare for the migration.
Which three actions should you perform in sequence? To answer, move the appropriate actions form the list of actions to the answer area and arrange them in the
correct order.
Select and Place:
Answer: 
Explanation:
Before the migration to Exchange Online we must set up a hybrid deployment.
Box 1: DirSync for both Forests
* What if I have a resource forest for Exchange and an account forest for logins?
Setup dirsync against the resource forest (this we need to do) and setup ADFS (this is already done) against the account forest. Eventually, collapse the resource
forest data into the account forest and then change dirsync to work against the account forest.Box 2, Box 3: Run the Hybrid Configuration Wizard in each Forest
Multi-forest and Multi-tenant scenarios with Office 365
http://blogs.technet.com/b/educloud/archive/2013/08/02/multi-forest-and-multi-tenant-scenarios-with-office-365.aspx?pi47623=3
Interesting… https://technet.microsoft.com/en-us/library/jj873754(v=exchg.150).aspx:
For hybrid deployment features and considerations, multi-forest organizations are defined as organizations having Exchange servers deployed in multiple Active Directory forests. Organizations that utilize a resource forest for user accounts, but maintain all Exchange servers in a single forest, aren’t classified as multi-forest in hybrid deployment scenarios. These types of organizations should consider themselves a single forest organization when planning and configuring a hybrid deployment.
Bullshit question DirSync cannot be downloaded anymore, official supercedence is AAD Connect.