Which of the following statements is(are) correct? 1. A higher debt-to-asset ratio will reduce the internal growth rate, other things equal. II. The internal growth rate is maximized when the payout ratio equals zero. III. A firm that wants to increase its sustainable growth rate can do so by increasing the plowback ratio or by decreasing ROE. IV. Shareholders' risk preferences are not typically included among the three major components of a financial planning model. A. I, II, and IV B. II C. I and III D. I and