when will bonds sell at a discount?

When will bonds sell at a discount? When the credit standing of the issuing company is not as good as other companies in a similar line of business. When the stated rate of interest is less than the yield rate of interest at the time of issue. O When the stated rate of interest is more than the yield rate of interest at the time of issue. When the issuing company will be able to retire the bonds at less than face at maturity