Your network contains two Active Directory forests named contoso.com and litwareinc.com.
You deploy System Center 2012 R2 Configuration Manager Service Pack 1 (SP1) to the contoso.com
forest.
You deploy the Configuration Manager client to all of the client computers in contoso.com by using a
logon script.

All of the client computers in litwareinc.com run a local firewall to prevent traffic to the
administrative shares.
You need to ensure that the Configuration Manager client can be deployed to all of the client
computers in litwareinc.com.
Which three tasks should you perform? Each correct answer presents part of the solution.

A.
Create a Group Policy-based installation of the Configuration Manager client.

B.
Enable Active Directory System Discovery.

C.
Copy the Cmsetup.msi file to a network share.

D.
Configure a Client Push Installation account.

E.
Enable Client Push Installation.

F.
Enable Active Directory Forest Discovery.

Explanation:
Planning for Discovery in Configuration Manager
https://technet.microsoft.com/en-us/library/gg712308.aspx