Assume that a firm has no debt. The market changes in equity closely mirror the market as a whole (i.e., the firm has a beta of 1.00). What is the equity beta of the firm given the following debt-to-equity assumptions assuming a 21% tax rate?

a) D/E = 0.00 b) D/E = 0.50 c) D/E = 1.00 d) D/E = 5.00