You have an Exchange Server 2007 organization.  All users connect to mailboxes by using Microsoft Office Outlook 2003. You plan to transition the organization to Exchange Server 2010.  You need to recommend a solution for mailbox access that meets the following requirements： .Minimize support costs.Minimize software costs .Provide access to Public Folders What should you recommend？（）

• A、Implement POP3 and IMAP4 access.
• B、Implement Personal Archives and forms-based authentication.
• C、Implement Autodiscover and upgrade all client computers to Outlook 2010.
• D、Implement Outlook Anywhere and modify the Outlook RPC encryption settings.