Rank the following long-term debt securities in terms of highest to lowest yield (assume the securities are issued by the same company) a)subordinated debt, unsecured notes, fixed-charge debenture, floating charge debenture b)fixed-charge debenture, floating charge debenture, unsecured notes, subordinated debt c)subordinated debt, unsecured notes, floating charge debenture, fixed charge debenture d)subordinated debt, floating charge debenture, fixed charge debenture, unsecured notes