You have an Exchange Server 2010 Service Pack 1 organization named contoso.com.All users have the  contoso.com e-mail address suffix. You discover that both anonymous and authenticated users can post content to a public folder named Folder1 by sending e-mail messages to folder1@contoso.com.You need to prevent all users from posting content to Folder1 by sending e-mail.What should you do？（）

• A、From Outlook Web App （OWA）， modify the properties of Folder1.
• B、From the Exchange Management Shell， modify the permissions of the default Receive connector.
• C、From the Public Folder Management Console， modify the properties of Folder1.
• D、From the Exchange Management Console， modify the properties of the Public Folder database.