How many of the bonds described below are trading at a premium? Bond I: 10 year annual, $100 par value, YTM = 8%, Coupon Rate = 5% Bond II: 100 year annual, $75 par value, YTM = 2%, zero coupon Bond III: 1 year annual, $1000 par value, YTM = 7%, Coupon Rate = 6% Bond IV: 6 year annual, $150 par value, YTM = 4%, Coupon Rate = 4%