Which one of the following statements is TRUE? a. When lenders protect themselves from the risk of asset switching by charging a higher interest rate, the firm's WACC can decrease. b. A lender calling in a corporate loan and then lending the funds out to a safer borrower is an example of asset switching. c. Firms borrowing money have greater flexibility to use that money when there are debt covenants. d. Lenders will protect themselves from the risk of asset switching by writing debt covenants into loans. e. Lenders can't legally prevent a firm from engaging in asset switching