You need to ensure that the user has a mailbox and appears in the Exchange on- premises GAL and the Office 365 GAL

Your company has a hybrid deployment Office 365. You create a user in Office 365. The next day, you
discover that the new user account fails to appear in the Microsoft Exchange Server on- premises global
address list (GAL).
You need to ensure that the user has a mailbox and appears in the Exchange on- premises GAL and the
Office 365 GAL.
What should you do?

A.
Assign a Microsoft Exchange Online license to the user account.

B.
From the Microsoft Online Services Directory Synchronization tool, enable rich coexistence.

C.
From the Office 365 portal, modify the sign-in status of the user account.

D.
Delete the user account hosted on Office 365. From the Exchange Management Console, create a
new remote mailbox.