Select all that are true with respect to the cost of debt. it is the return the firm needs to earn overall to satisfy all investors It is the rate the debt holders demand given the risk they face as debt holders Can be estimated using CAPM Cannot be estimated using CAPM because CAPM is used for estimating the cost of equity Is always equal to the YTM on a company's existing bonds Is lower than the YTM on a company's existing debt if there is default risk Can be proxied by the YTM on a company's existing debt if the debt is risk free