Per the Nicholas and Steyn text, the basic life cycle of human-designed systems is the series of logical, structured steps called the systems development cycle. The following figure shows the four-phase of the system development cycle. Phase A: Conception phase Phase B: Definition phase Phase D: Operation phase. Phase C: Execution phase. System Improvement (To Phase A: repeat cycle) System termination The three descriptions given below describe the overall focus and efforts undertaken in Phase A, Phase B and Phase C. Fill in the blank with A, B or C that corresponds to each description. Focuses on the solution and defines what to build and how to build it (master plan). From an idea, build a physical end item. Focus on problem and define what is needed.