Concept:Debentures are long-term loan instruments issued by companies under seal, carrying fixed interest.Explanation:A debenture is a formal certificate acknowledging a company’s debt.It promises to repay the stated amount on a specified date.It pays interest at a fixed rate regardless of profit.Debentures may be redeemable, meaning repayable on a set date, or irredeemable, meaning repayable only when the company is wound up.These features match exactly what the question describes.Answer:A. debenture