The stages within the development phase of the software life cycle are（ ）．
软件生命周期开发阶段的阶段是

A. design,analysis,implementation,and testing设计、分析、实现和测试

B. analysis,design,implementation,and testing分析、设计、实现和测试

C. analysis,design,testing,and implementation分析、设计、测试和实现

D. design,analysis,testing,and implementation设计、分析、测试和实现