There is a bivariate joint density function between the variables Y and X where Y takes the values: -2, -4, -6. You are told E(X|Y = -2) < E(X|Y = −4) < E(X|Y = -6), What does this tell you about cov(X, Y)? O a. cov(X, Y) > 0 O b. cou(X, Y) = 0 O c. cov(X, Y) < 0 O d. It is not possible to impute the sign of the cov(X, Y).

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