You work as an IT professional in an international corporation named Wiikigo. In the company, your job is to configure Microsoft Internet Security and Acceleration Server 2006. And you are experienced in performing and managing networks and operational systems. In addition, you are skilled at deploying ISA Server 2006, configuring firewall settings, and optimizing performance of the ISA Server 2006 cache. There is a head office and five branch offices in the company. The six offices use high-speed network links to connect. The head office is the only location that has an Internet connection. There is a server named ISA01 in the head office. You plan to have ISA Server 2006 deployed on ISA01. Two network adapters are contained in ISA01. They are respectively named NA01 and NA02. NA1 is connected to the internal network and NA02 is connected to the Internet. You intend to have ISA01 configured to cache Web content for all users and to have all computers defined as Web Proxy clients. You must make sure that the Internet can be accessed by users from the head office and the branch offices. What action should you perform?

A.
On NA02, you must guarantee that the default gateway entry is blank. For each branch office network, a static route defined on ISA01.

B.
A default gateway address should be specified on NA02. A default gateway address should be defined on NA01.

C.
A default gateway address should be specified on NA02. For the head office network, a static route should be defined on ISA01.

D.
A default gateway address should be specified on NA02. For each branch office network, a static route should be defined on ISA01.