Which two actions should you recommend?

You are an administrator for a company named Contoso, Ltd. Contoso has an Exchange
Server 2013 organization. Contoso has a partnership agreement with a company named A .
Datum Corporation. A . Datum has an Exchange server 2013 organization. Both
organizations have a federation trust to the Microsoft Federation Gateway. Users at Contoso
plan to share their free/busy information with users at A . Datum. You need to recommend
which tasks must be performed to ensure that the A . Datum users can see the free/busy
information of the Contoso users. Which two actions should you recommend? (Each correct
answer presents part of the solution. Choose two.)

A.
In the Exchange Server organization of Contoso, configure directory synchronization.

B.
In the Exchange Server organization of A. Datum, create a sharing policy.

C.
In the Exchange Server organization of A. Datum, configure directory synchronization.

D.
In the Exchange Server organization of Contoso, create an organization relationship.

E.
In the Exchange Server organization of Contoso, create a sharing policy.

F.
In the Exchange Server organization of A. Datum, create an organization relationship.

Explanation:
C: Active Directory synchronization must be configured for all users that need to share
free/busy information between the organizations.
Note:
* Using federated delegation, users in your on-premises Exchange organization can share
free/busy calendar information with recipients in other Exchange organizations that are also
configured for federated delegation.
* To configure free/busy sharing between two federated Exchange organizations, complete
the steps in Configure Federated Delegation for both organizations.
* Using federated delegation, users in your on-premises Exchange organization can share
information with recipients in other Exchange organizations that are also configured for
federated delegation. This connection is established by creating organization relationships
between the two organizations or by using a sharing policy, which allows users to create
sharing relationships on an individual basis.
Reference: Configure Free/Busy Sharing Between Exchange Organizations