The proof that OLS is BLUE requires all of the following assumptions with the exception of: a. the errors are homoskedastic.
b. the errors are normally distributed.
c. $E \left( u _ { i } \mid X _ { i } \right) = 0$.
d. large outliers are unlikely.

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The Answer of The proof that OLS is BLUE requires all of the following assumptions with the exception of: a. the errors are homoskedastic.
b. the errors are normally distributed.
c. $E \left( u _ { i } \mid X _ { i } \right) = 0$.
d. large outliers are unlikely.

The Proof That OLS Is BLUE Requires All of the Following