You are designing an Active Directory implementation strategy to present to executives from your company and from Contoso， Ltd.  Which implementation strategy should you use？（）

• A、 Upgrade the New York domain. Upgrade the Chicago domain. Create a pristine forest for Contoso， Ltd.
• B、 Create a pristine forest. Upgrade the New York domain. Upgrade the Chicago domain. Do nothing further.
• C、 Create pristine forest. Upgrade the New York domain.Upgrade the Chicago domain.Create a pristine forest for Contoso， Ltd.
• D、 Create a pristine forest.Upgrade the New York domain. Upgrade the Chicago domain.Create a new child domain for Contoso， Ltd.