A debt is said to be selling at par, when the _____ of the d…

A debt is said to be selling at par, when the _____ of the debt is equal to the _____.   a.  par value; discounted value of the interest payments   b.  principal value; discount on the issue of a zero coupon bond   c.  face value; premium payment on the exercise of a call provision   d.  market value; face value of the debt