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 an ISA Server 2004 Enterprise Edition array in the company network. Two servers are contained array contains. The two servers are respectively named ISA01 and ISA02. Both ISA01 and ISA02 have a Configuration Storage server installed locally and are replicas of the same array. The company requires that both ISA01 and ISA02 should be upgraded to ISA Server 2006. The upgrade must reduce interruptions to Internet access and cut down hardware costs Since you are the technical support, the company assigns this task to you. So what action should you perform?

A.
On ISA1, the ISA Server 2004 configuration should be backed up, ISA Server 2004 should be uninstalled, ISA Server 2006 should be installed, and then the ISA Server 2004 configuration should be imported.
On ISA02, the Configuration Storage server should be uninstalled, an in-place upgrade of ISA Server 2006 should be performed, and then a Configuration Storage server should be installed as a replica of ISA01.

B.
The ISA Server 2004 configuration should be backed up on ISA01. ISA01 and ISA02 should be removed from the array. On ISA01 and ISA02, an in-place upgrade of ISA Server 2006 should be performed on ISA01 and ISA02.

C.
The ISA Server 2004 configuration should be backed up on ISA01. A new Configuration Storage server should be installed on a new server named ISA03, and then the configuration from should be imported from ISA01. The Configuration Storage server should be uninstalled on ISA01 and ISA02, and then perform an in-place upgrade of ISA Server 2006.

D.
The ISA Server 2004 configuration should be backed up on ISA01. ISA Server 2004 should be uninstalled on ISA01 and ISA02. ISA Server 2006 should be installed on ISA01, and then the ISA Server 2004 configuration should be imported. On ISA02, ISA Server 2006 should be installed on ISA02 and a Configuration Storage server should be included as a replica of ISA01.