Which of these statements in NOT an advantage of the Waterfall SDLC?

a The deployment schedule can stay more flexible

b Except for reviews, approvals, status meetings, etc., a customer presence is not strictly required after the requirements phase.

c Progress is more easily measured, as the full scope of the work is known in advance.

d The software can be designed completely and more carefully, based upon a more complete understanding of all software deliverables.

e Developers and customers agree early in a project on what will be delivered.