You need to migrate a Microsoft Exchange Server 2007 organization that has 50 mailboxes to Exchange Online
by using the cutover migration method.
Which two requirements should be met before you can begin the mailbox migration? Each correct answerpresents part of the solution.

A.
The migration administrator account must be granted Full Access permission for each on-premises mailbox
that will be migrated.

B.
The migration administrator account must be granted Send As permission for each on-premises mailbox
that will be migrated.

C.
Exchange Web Services (EWS) must be enabled and accessible from the Internet.

D.
The migration administrator account must be granted Receive As permission for each on-premises mailbox
that will be migrated.

E.
Outlook Anywhere must be enabled and accessible from the Internet.

Explanation:
A: To migrate the mailboxes, the admin must have one of the following permissions:
The migration administrator must be assigned the FullAccess permission for each on-premises mailbox.
or
The migration administrator must be assigned the Receive As permission on the on-premises mailbox
database that stores user mailboxes.
E: The email migration service uses Outlook Anywhere (also known as RPC over HTTP), to connect to your onpremises Exchange Server.
https://support.office.com/en-us/article/Perform-a-cutover-migration-of-email-to-Office-365-
9496e93c-1e59-41a8-9bb3-6e8df0cd81b4?ui=en-US&rs=en-US&ad=US