An underlying concept for the interaction among the project management processes is the ______ .
A．plan-do-check-act cycle(as defined by Shewhart and modified by Demin
B．plan-do-analyze-check-act-standardize cycle (as defined by Shewhart and modified by Demin
C．ready-aim-fire cycle linked by results
D．conceptualize-design-execute-finish(CDEcycle
