Choose the option(s) to correctly complete the following sentence. From the perspective of a potential investor in a firm, investing in the firms debt is considered to be less risky than investing in the firms equity because: I. principal and interest payments are debt and are contractually obligated. II. debtholders are paid back before equity holders in case of bankruptcy. III. a firm that includes debt in its capital structure has lower fixed costs than an all-equity firm. I only I and II only I and III only I, II, and III