【单选题】
You work in a company which uses SQL Server 2008. You are the administrator of the company database. Now you are in charge of a SQL Server 2008 instance. A new SQL Agent job has been created by you. The job includes a Windows PowerShell job step which transfer data between servers by using the SQLCmd utility. If the job fails, you must make sure that an operator named ReactGroup is informed by receiving an e-mail. <br /> So what action should you perform to achieve this goal? （） 
A、First you should enable Notifications. Direct the Notification to the ReactGroup operator on job failure after you create the ReactGroup operator.
B、First you should enable Notifications. Direct the Notification to the ReactGroup operator on failure of the Powershell job step after you create the ReactGroup operator.
C、First you should assign the ReactGroup operator as the failCsafe operator. Then enable the job after you create the ReactGroup operator.
D、First you should configure the job step proxy account to use the ReactGroup operator account after you create the ReactGroup operator. At last choose the proxy account for the e-mail profile.
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