DRAG DROP
You are an Office 365 specialist for a consulting company.
Your company has been hired by several companies to migrate their legacy email solutions to Office 365.
You need to recommend mailbox migration strategies for the scenarios described in the following table.
Which strategies should you recommend? To answer, drag the appropriate migration types
to the correct targets. Each migration type 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: 
Explanation:
Staged, cutover, hybrid, and IMAP
Mailbox Migration to Exchange Online
http://technet.microsoft.com/en-us/library/jj863291(v=exchg.150).aspx
Thanks for listing the options and no answer. You’ve provided a great service to the community.
What is the correct answer??
The current answer is correct, for any Exchange above 2010 your only fisable way of moving emails to O 365 is remote move migration, while if you use any other email provider your option is IMAP migration. Sometimes MS my trick and ask you that the client has Exchange 2010, but they don’t want to move their Calendar and Contacts, your option is IMAP migration.
Answer is correct:
Remote Move Migration
IMAP Migration
There are two clues to the first question. The first being the number of mailboxes (15000) which narrows it down to the following migration methods:
Staged Migration
Remote Migration
The second clue for the first scenario is the requirement to use MRS to move the mailboxes. MRS requires a hybrid setup and the Remote Migration supports that.
On the second scenario there are again two clues:
-The mailboxes to be migration reside on a non-exchange messaging system. IMAP migration supports this.
-Move only user-specific mail folders. This is a limitation of IMAP.
Answer is:
Remote Move Migration
IMAP Migration
But beware… very important part is the Exchange 2010 SP3- without SP3 it will fail. Both for remote move or when installing Exchange 2016 On Premise as part of the same Exchange namespace.