【单选题】

The SystemsDevelopment LifeCycle(SDLC、is a process of creating or altering information systems, and the models and methodologies that people use to develop these systems．Sequential SDLC、models, such as ______, focus on complete and correct planning to guide large projects and risks to successful and predictable results．

A．Waterfall
B、Extreme Programming
C．SpiralD．Rapid Prototyping