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Table 1. Data Y X1 X2 X3 X4 12 0 2 5 2 13 0 3 7 2 13.2 1 6 13 2 13 1 7 1.5 2 12 0 7 1.5 2 11 0 8 17 2 Using data in Table 1 suppose that you estimate the following regression Y; = ,80 + i6le + us. There is a concern that omitting X2 from the equation could bias the estimate of 191. Under what condition(s) is [91 biased? O ,8] will be biased if Covrx1,x2} 7 0 O None of these options is an answerto this question. O ,8] will always be biased if x2 is omitted O ,8] will be biased ifx2 has no effect on y O ,8] will be biased if Covfx1,x2} = 0