The following monthly data of yields on five-year Treasury bonds comes from the Reserve Bank Bulletin: 20xx/xx Jul. 7.65% Jan. 7.30% Aug. 7.75% Feb. 7.15% Sep. 7.80% Mar. 6.91% Oct. 7.90% Apr. 6.80% Nov. 7.75% May 6.65% Dec. 7.50% Jun. 6.55% What type of yield curve is indicated by the above data set? Select one: O a. Normal yield curve O b. Inverse yield curve O c. Humped yield curve O d. Variable yield curve