Which of the following is most correct regarding a firms weighted average cost of capital WACC?

	a.	It is the return required by a firms stockholders.
	b.	It should be equivalent to the YTM on a firms bonds
	c.	It is the discount rate that managers can use to evaluate projects of average risk.
	d.	It is the return that a firm must achieve on its average investment project in order to satisfy its investors.
	e.	Both C and D.