Which of the following are valid statements about corporate bond? Select all the correct responses. O a. Corporate bond coupon payments are not guaranteed. As a result, corporate bonds typically trade at higher yields than government bonds. O b. Corporate bond coupon payments are not guaranteed. As a result, corporate bonds typically trade at higher prices than government bonds. O c. Corporate bond coupon payments are not guaranteed. Therefore, in order to issue a bond at par value, corporations need to offer a higher yield than a comparable maturity par-valued government bond. O d. A corporate bond with a AAA rating is considered to be of higher quality than one with a BBB rating. O e. Corporate bonds exist only to frustrate finance students. (Do not pick this answer despite any temptation to do so.)