You support Skype for Business Server 2015 servers in your customers company network. You enable federation with Skype f

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You support Skype for Business Server 2015 servers in your customers company network. You enable federation with Skype for Consumers.
Users of Skype for consumers are unable to participate in instant messaging (IM) conversations in your customers organization.
You need to ensure that the users of Skype for Consumers clients are able to participate in IM conversations.
Which two actions should you perform? Each correct answer presents part of the solution.

A. Create a SIP federated provider.
B. Enable an archiving disclaimer to federated partners.
C. Enable partner domain discovery.
D. Create an external access policy.