DRAG DROP
You are migrating Active Directory Domain Services (AD DS) domains to Azure.
You need to recommend the least complex directory synchronization solution.
What should you recommend? To answer, drag the appropriate solution to the correct client
requirement. Each solution may be used once, more than once, or not at all. You may need to drag
the split bar between panes or scroll to view content.
Answer: 
Given answers are correct
Given answers are correct>
Book – Architecting Microsoft Azure Solutions – Page 78
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During synchronization, you can choose whether hashes of user passwords are synchronized,
as well. If the password hashes are synchronized, the target directory can carry out
authentications without the involvement of the original directory.
Otherwise, the actual authentication operations are passed back to the original directory.
For instance, when you synchronize an on-premises AD DS with Azure AD, if password hashes are synchronized authentications are carried out by Azure AD. Otherwise, the authentication operations are passed back to the on-premises directory.