25.On December 29, 2019, X Corporations issued shares of to its major creditor, Y. The right gives rise to Y to be able to change the debt of X Corp. into such shares after 1 year. On December 30, 2020, Y exercise the feature of this share. The shares issued to Y by X Corporation is called

a.Preferred shares c. Promotional Shares

b.Convertible Shares d. Redeemable Shares