19. To calculate a 95% confidence interval for the natural log of the odds ratio from a 2x2 table depicting exposure by disease, we should use a. In( )+Z 1 1 1 1 1 - 2 abcd b. exp In ) +Z 1 + 1 1 a bcd c. In()+t 1 1 + .+ 1 1 - - Ja+b+c+d-1 \\ a b C d d. exp In uit 1 1 1 1 1-4,a+b+c+d-1 \\a b c d