Which option does not relate to the waterfall model

Question $2$Answer

a$.$

a handful of phases are repeated again and again, with the completion of each cycle incrementally improving and iterating on the software

b$.$

Phases are discovery, design, coding, testing, deployment, maintenance

c$.$

Drawback is that a defect generated in one phase and detected in a later phase, should not imply correction the defective initial phase

d$.$

The waterfall model is a simple representation of the basic sequential model