You work in a company which is named Wiikigo Corp. The company uses SQL Server 2008. You are the administrator of the company database. Now you are in charge of a SQL Server 2008 instance. The server hosts databases for several mission-critical applications. Microsoft SQL Server Management Studio executes queries and it has some effect. Now you intend to limit the effect by using the Resource Governor. You must make sure that queries initiated through SQL Server Management Studio is less than 20 percent of CPU utilization, besides this, you must make sure that queries initiated by the mission-critical applications can consume 100 percent of CPU utilization when required. So what action should you perform to achieve this goal? （）

A.You should alter the default resource pool and set the MAX_CPU_PERCENT option to 80. Then assign this resource pool to the workload group used by SQL Server Management Studio. 
B.First, you should create a new resource pool and set the MAX_CPU_PERCENT option to 20. Then assign this resource pool to the workload group used by SQL Server Management Studio. 
C.You should alter the default resource pool and set the MAX_CPU_PERCENT option to 20. Then assign this resource pool to the workload group used by the mission-critical applications. 
D.First, you should create a new resource pool and set the MAX_CPU_PERCENT option to 80. Then assign this resource pool to the workload group used by the mission-critical applications.