All Are Disadvantages of the SDLC Model, Except

Multiple Choice

All are disadvantages of the SDLC model, except:

A) One cannot see the working version of the application until the end phase is reached
B) Once a phase is completed there is no going back even though subsequent changes to the model incorporate iterative capability
C) It is easier to understand and use
D) Strict testing and sign-off of each phase before moving to the next stage may cause undue delays