Callable debt means that: The firm has the right to convert the bond into a share O a. O b. The firm has the right to redeem the bond at an earlier time; the firm is doing this because the interest rate increased after the issuance date of the bond None of the other options O c. The firm has the right to redeem the bond at an earlier time; the firm O d. doing this because the interest rate decreased after the issuance date of the bond O e. The holder of the bond with call right has the right to buy a share of the firm which issued the bond