You work as the exchange administrator at TestKing.com. The TestKing.com network contains two ActiveDirectory sites named TestKing1 and TestKing2. TestKing1 and TestKing2 are connected to each other bymeans of a WAN link. You receive notification during the day to plan the deployment of two Exchange Server 2010 Mailbox servers and two Client Access servers at TestKing1 and TestKing2. Every site will include a Client Accessarray. You are instruced to recommend a solution in order to deploy the Hub Transport servers. You have tomake sure that e-mail messages will be delivered to users in other sites if a Hub Transport server shouldbe fail. Your solution should also reduce the amount Exchange servers being deployed as well as supportthe deployment of the Client Access array. What should you do？ （）

A. Your best option would be ensure that two Hub Transport severs are deployed on two new servers in TestKing1 and TestKing2.
B. Your best option would be add the Hub Transport server role to all Mailbox servers.
C. Your best option would be to ensure that a Hub Transport server is deployed on a new server.Thereafter the SMTP service should be installed on every Client Access server.
D. Your best option would be to add the Hub Transport server role to every Client Access server.