(a) Referring to the spiral model, describe the four activities to be repeated in each iteration of the development process. Explain why the four activities designated are to be repeated in each iteration of the development process. [5 marks] (b) Referring to the spiral model, what new activities were added to the classic SDLC model and what is their main contribution to the success of the projects? How are these relevant to the SQA tool implementation analysis as discussed in the article. [8 marks] (c) Software reuse has become an important factor in the software development industry. List the benefits of software reuse. [6 marks] (d) Theoretically, verification reviews should be sufficient. Still, SQA professionals recommend performance of validation and qualification reviews as well. What do they expect to gain by adding a validation review and qualification review? Give your views based on the given article analysis. [6 marks]