【单选题】对于以下标签[br][/br]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);%