You have an Exchange organization.All servers in the organization have Exchange Server 2010 Service Pack 1 （SP1） installed. You need to ensure that each user who sends a meeting request to a room mailbox receives a custom message from the mailbox. What should you do from the properties of the mailbox？（）

• A、Configure the Mailbox Features settings.
• B、Configure the Mail Flow settings.
• C、Enable the Resource Booking Attendant.
• D、Configure the Resource Information settings.
• E、Configure the Resource In-Policy Requests settings.
• F、Configure the Resource Policy settings.