Your network contains two Active Directory sites. The sites connect to each other by using a WAN link. 
You plan to deploy two Exchange Server 2010 Mailbox servers and two Client Access servers in eachsite. 
Each site will contain a Client Access array. 
You need to recommend a solution to deploy Hub Transport servers. The solution must meet the following requirements：
.Continue to deliver e-mail messages to users in other sites if a single Hub Transport server fails .Support the planned Client Access array deployment.Minimize the number of Exchange servers
What are two possible ways to achieve this goal？（）

Your network contains two Active Directory sites named Site1 and Site2. Only Site1 can be accessed from the Internet. You have an Exchange Server 2010 organization. 
You deploy a Client Access server in Site1 and enable Windows Integrated Authentication for OutlookWeb App （OWA）. 
In Site2， you deploy a Mailbox server and a Client Access server. 
You need to configure the Exchange organization to meet the following requirements：.Allow users to access their mailboxes from the Internet by using OWA 
.Prevent authentication prompts from displaying when users connect to OWA by using domain- joinedcomputers that are connected to the internal network 
What should you do？（）