The market shares (in percentage terms) for the 12 firms that comprise an industry are 15, 12, 11, 10, 8, 7, 7, 6, 6, 6, 6, and 6. The Herfindahl index is __________ and the four-firm concentration ratio is __________.
a. 932; 48 percent
b. 1,032; 27 percent
c. 1,000; 48 percent
d. 950; 24 percent
e. none of the above