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MM Proposition I with corporate taxes states that:

I. capital structure can affect firm value by an amount that is equal to the present value of the interest tax shield;
II. by raising the debt-to-equity ratio, the firm can lower its taxes and thereby increase its total value;
III. firm value is maximized by using an all-equity capital structure

a. I only
b. II only
c. III only
d. I and II