你工作在一个售书公司.你正在基于SQL SERVER 2005数据库创建一个报表。此报表显示本月超过销售配额的销售代表及他们的销售额 。已知，销售配额为$2，000。查询的起始日期和截至日期以变量@FromDate 和 @ToDate 传递进来。为了实现满足上述条件的报表，你应该使用下面哪一个SQL查询语句？（）
- ASELECT s.AgentName，SUM（ISNULL（o.OrderTotal，0.00））AS SumOrderTotal FROM SalesAgent s JOIN OrderHeader o ON s.AgentID = o.AgentIDWHERE o.OrderDate BETWEEN @FromDate AND @ToDate GROUP BY s.AgentName
- BSELECT s.AgentName，SUM（ISNULL （o.OrderTotal，0.00））AS SumOrderTotal FROM SalesAgent s JOIN OrderHeader o ON s.AgentID = o.AgentIDWHERE o.OrderDate BETWEEN @FromDate AND @ToDate AND o.OrderTotal >= 2000 GROUP BY s.AgentName
- CSELECT s.AgentName， SUM（ISNULL （o.OrderTotal，0.00））AS SumOrderTotal FROM SalesAgent s JOIN OrderHeader o ON s.AgentID = o.AgentID WHERE o.OrderDate BETWEEN @FromDate AND @ToDateGROUP BY s.AgentNameHAVING SUM（o.OrderTotal） >= 2000
- DSELECT s.AgentName,SUM（ISNULL（o.OrderTotal，0.00））AS SumOrderTotal FROM SalesAgent s JOIN OrderHeader o ON s.AgentID=o.AgentIDWHERE o.ordertotal =2000 AND o.OrderDate BETWEEN @FromDate AND @ToDate GROUP BY s.AgentName HAVING SUM（o.OrderTotal）>= 2000