You have an Exchange Server 2013 organization named adatum.com. The organization contains two
servers named EX1 and EX2 that are configured as shown in the table.

Both servers are members of a database availability group (DAG). EX1 has the active copy of a
database named Database1.
Several users who have mailboxes in Database1 discover that all of their outbound email messages
remain in their Drafts folder when they use Outlook Web App.
You need to ensure that the email messages are delivered.
What should you do?

A.
On EX2, retry the message queues.

B.
On EX1, start the Microsoft Exchange Mailbox Transport Submission service.

C.
On EX2, start the Microsoft Exchange Mailbox Transport Submission service.

D.
On EX1, retry the message queues.