You have an Exchange Server 2010 organization.Users access their e-mail from the Internet by using Outlook Web App.You need to prevent users from downloading ZIP files from Outlook Web App.The solution must ensure that users can download ZIP files by using Microsoft Office Outlook. What should you do？（）
- AConfigure the Content Filter agent.
- BConfigure the Attachment Filter agent.
- CCreate a managed folder mailbox policy.
- DCreate an Outlook Web App Mailbox policy.