What is our textbook authors' main objection to the "Waterfall method"?

	a.	It forces employees to create design solutions based on the wishes of their bosses and not actual users.
	b.	It gets people wet for no other reason than that it makes their bosses laugh.
	c.	It lacks built in "sanity-checking" steps to modify assumptions to match the reality of the environment.
	d.	It devotes equal time to the stages of research,design, and development- when these never take equal time.
	e.	It deemphasizes design in favor of a greater amount of time spent on development