In the Best Practices in Calculating Cost of Capital reading, analysts and companies were surveyed to determine the methods most commonly used in practice. Which of the following practices is one of the common best practices used in industry to calculate WACC?

	a.	Using betas self-calculated by the company or adviser
	b.	Using 90-day T-bills to determine the risk-free rate
	c.	All of the above are best practices used in calculating the cost of capital
	d.	Using the DCF model (discounted cash flow or dividend growth model) to calculate the cost of equity
	e.	Using the marginal cost to estimate the before-tax cost of debt