In the multi-index model below, a mispricing will exist whenever Erint - rf,t) =; + Bi,1 E(F1,t)+31,2E(F2,t)+Bi,3 E(F3,t) O a. a is significant O b. B(s) is (are) significant O c. a is not significant O d. B(s) is (are) different than zero Oe. a is positive O f. None of the given choices is correct