16. If system requirements are poorly understood, and you need to clarify what is really needed, which process model is preferable to be used? A. Reuse-oriented B. Waterfall C. Incremental development D. Spiral Development Model 17. The correct order of the RUP phases is A. Inception, transition, elaboration, and construction B. Elaboration, construction, inception, and transition C. Inception, elaboration, transition, and construction D. Inception, elaboration, construction, and transition 18. Which of the following is TRUE about Extreme Programming testing? A. Users involve in acceptance tests. B. Tests are not automated. C. A and B D. Neither A nor B