Explanation/Reference:
Explanation:
From the scenario:
The ADatum mailboxes will be migrated to the Exchange Online tenant of Contoso by using the IMAP

migration method.
You can use IMAP to migrate user email from email systems that support IMAP migration. When you migrate the user's email by using IMAP migration, only the items in the users' inbox or other mail folders are migrated. Contacts, calendar items, and tasks cannot be migrated with IMAP, but they can be by a user.
IMAP migration also does not create mailboxes in Office 365. You'll have to create a mailbox for each user before you migrate their email.
Incorrect Answers:
B, D, E: Contacts, calendar items, and tasks cannot be migrated by using IMAP migration.
References: https://docs.microsoft.com/en-us/Exchange/mailbox-migration/migrating-imap-mailboxes/ migrating-imap-mailboxes Question Set 1