Your company is planning to migrate to Microsoft Exchange Online. The company employs 1,000 people, each with a mailbox currently located on Exchange 2010 on-premises. You estimate that it will take a minimum of four weeks to migrate all mailboxes from on-premises Exchange to Exchange Online.
The company has the following migration requirements:
During the migration, do not change the existing Microsoft Outlook profiles and .ost files used by the employees.
Ensure that email messages sent between on-premises mailboxes and online mailboxes during the migration are secure.
Do not send email messages between on-premises mailboxes and online mailboxes over the Internet in plain text.
You need to select the migration strategy that meets the requirements.
Which migration strategy should you use? organization in Microsoft Office 365 for enterprises and then connect it to your existing on-premises Exchange current hosted environment or have access to the data only by using the IMAP 4 protocol.

A.
Hybrid migration only

B.
IMAP migration followed by staged migration

C.
Staged migration only

D.
Staged migration followed by remote move migration

Explanation:
You can use a hybrid migration to migration from Exchange 2010 to Exchange Online.
Note: In the Deployment Assistant, a hybrid deployment is when you create a new Exchange Online Exchange
2010 organization by configuring Active Directory synchronization and using the Hybrid Configuration wizards.
Incorrect Answers:
B: IMAP migration is targeted at customers who may be using non-Exchange-based mail systems in their
C, D: You can’t use a staged migration to migrate Exchange 2013 or Exchange 2010 mailboxes to Office 365.
References: https://support.office.com/en-us/article/Decide-on-a-migration-path-0d4f2396-9cef-43b8-9bd6-
306d01df1e27?ui=en-US&rs=en-US&ad=US