对于以下
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它与下列哪个选项中的Java程序片段等价 A. <%CounterBean myBean=(CounterBean)request.getAttribute(“myBean”);if(myBean==null)myBean = new CounterBean();%> B. <%CounterBean myBean=(CounterBean)request.getAttribute(“myBean”);if(myBean==null){myBean = new CounterBean();request.setAttribute(“CounterBean”,myBean);}%> C. <%CounterBean myBean=(CounterBean)request.getAttribute(“myBean”);if(myBean==null){myBean = new CounterBean();request.setAttribute(“myBean”,myBean);}%> D. <%CounterBean myBean=new CounterBean();request.setAttribute(“myBean”,myBean);%>