After running a multivariate regression, we use an F test to test the null hypothesis that β3 = β4 = 0. We get an F statistic which is larger than the critical value at our specified significance level. We would conclude that: a. None of the listed options. b. β3 ≠ 0 and β4 ≠ 0. c. β3 > 0 or β4 < 0. d. β3 ≠ β4. e. β3 <0 or β4 > 0. f. β3 > 0 or β4 > 0.