An organization called contoso.com has Exchange Server 2010.@contoso.com e-mail address suffix. Anonymous and Authorization user can post 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 folder 1， by sending e-mail.How should you do this？（）

• A、Default receive connector
• B、Public folder management console
• C、Creating Transport Protection Rules
• D、In Exchange Management Console， modify properties of Public Folder database.