You work as a network Exchange administrator at Company.com.The Company.com network currently consists of a single Active Directory forest containing a single domain named Company.com.The Company.com organization makes use of Microsoft Exchange Server 2010 as their messaging solution.Company.com users make use of Microsoft Office Outlook 2007 to access their mailboxes.A new Company.com directive states that all received e-mail messages located in the entire mailbox be archived after one year.It is important that e-mail messages of the finance department be kept for three years. What should you do？（）

A. Your best option would be to create a message classification.
B. Your best option would be to create a linked mailbox.
C. Your best option would be to create an Outlook Protection Rule.
D. Your best option would be to create a managed custom folder.