You are the enterprise administrator for an Exchange Server 2010 organization. All users run Microsoft Office Outlook 2010.  You are designing a sharing solution for your organization and a partner organization. The partner organization also uses Exchange Server 2010.  You need to recommend a strategy for sharing information with the partner organization to meet the following requirements： .Provide cross-organizational access to user contacts  .Provide cross-organizational access to free/busy information  What should you recommend？（）

• A、Creating cross-forest trusts
• B、Implementing Federated Sharing
• C、Implementing Microsoft Identify Lifecycle Manager （ILM） 2007
• D、Running the Microsoft Exchange Inter-Organization Replication tool