You are designing a forest and domain structure to address the concerns of Contoso, Ltd., and to meet the business and technical requirements. You want to use the minimum number of domains and forests that are required.  Which domain structure should you use?（）

• A、One forest and two domains.
• B、One forest and three domains.
• C、One forest and four domains.
• D、Two forests and three domains.
• E、Two forests and four domains.