The process of Iterative Model mentioned in this course is

A、Buildtheproductmodel-observetherealuserusage-collectuserfeedback-modifyandadjust;
B、Buildtheproductmodel-collectuserfeedback-observerealuserusage-modifyandadjust;
C、Collectuserfeedback-buildtheproductmodel-observerealuserusage-modifyandadjust;
D、Observerealuserusage-buildtheproductmodel-collectuserfeedback-modifyandadjust