Question: Need help please and thank you! A proxy variable should be uncorrelated with the true population regression error term O be uncorrelated with the error

Need help please and thank you!

A "proxy" variable should be uncorrelated with the true population regression error term O be uncorrelated with the error term in the mis-specified regression O be correlated with all the independent variables in the true population regression function O have the same expected value as the missing variable it is the "proxy" for O should have the same variance as the missing variable it is the "proxy" for

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