Which statement accurately describes a SDLC model?

• A. The waterfall model emphasizes sequential development.
• B. The iterative model emphasizes that the product may need to pass through the same phase multiple times, in a cyclical fashion.
• C. The spiral model emphasizes prototyping as part of the cyclical process.
• D. All of the above

Answer: (D)

In software development, different SDLC models describe how work flows from planning through design, implementation, testing, and maintenance. The waterfall model is understood as a linear, sequential approach where each phase is completed before the next begins, with limited backtracking. The iterative model treats development as a cycle of repeating phases to gradually refine the product, acknowledging that requirements or solutions may need adjustment over time. The spiral model blends iteration with risk management and prototyping, cycling through planning, risk analysis, engineering, and evaluation, often producing prototypes to explore options and reduce risk. Because each description accurately reflects its respective approach, all of these statements are true.