Which of the following statement(s) is/are correct about the debt and equity of a firm in view of option theory? 1. Equity can be viewed as a call option on the firm's asset II. The bondholders effectively write a call option on a firm's asset to the equity-holders. III. Increase of the asset volatility benefits the equity-holders at the expense of bondholders IV. Option pricing model can be used to price risky corporate bond I, II and IV only I, III and IV only II, III and IV only All of above