Which of the following statements is CORRECT?

	a.	When calculating the cost of preferred stock, a company does not need to adjust for taxes, because preferred stock dividends are not deductible by the paying corporation
	b.	Since the money is readily available, the after-tax cost of retained earnings is usually much lower than the after-tax cost of debt
	c.	All else equal, an increase in a companys stock price will increase its marginal cost of retained earnings, rs
	d.	All else equal, an increase in a companys stock price will increase its marginal cost of new common equity, re