Your network contains three Active Directory sites named Site1， Site2， and Site3. Users can only access Site1 from the Internet. In each site， you plan to deploy a Mailbox server and a Hub Transport server. You need to plan the deployment of Exchange servers to meet the following requirements： .Ensure that Exchange ActiveSync and Outlook Anywhere clients can connect to their Mailboxes from theInternet .Minimize hardware costs What should you include in your plan？（）
- AIn Site1，deploy one Client Access server.
- BIn each site，deploy one Client Access server.
- CIn Site1，deploy one Client Access server and one Edge Transport server.
- DIn each site，deploy one Client Access server and one Edge Transport server.