What should you do?

Your network contains an on-premises Active Directory Forest.

The forest contains the domains shown in the following table.

You have a Microsoft 365 subscription.

You plan to migrate only the mailboxes of contoso.com to Exchange Online.

You deploy an Exchange Online tenant that supports the contoso.com domain.

All incoming internet email and all email between Exchange Online and the Exchange Server are routed through server1.contoso.com.

After you migrate the first test mailboxes, you discover that the users in contoso.com that have mailboxes in Exchange Online cannot see any fabrikam.com recipients in the global address list (GAL).

You need to ensure that the contoso.com users can see the fabrikam.com recipients in the GAL

What should you do?
A . From Exchange Online, create an outbound connector for the (abrikam.com domain.
B. Add a TXT record to the DNS zone of the fabrikam.com domain.
C. Rerun the Hybrid Configuration wizard and add fabrikam.com as a domain in the hybrid configuration.
D. Configure Azure AD Connect to sync the fabrikam.com domain.