Each of the random variables X and Y takes only 3 values (1,2,3) with the following probabilities: 1 2 3 10 1/6 1/6 y 2 1/6 0 0 1/6 3 1/6 1/6 0 X and Y are: Select one: O a. uncorrelated O b. orthogonal O c. none of these O d. Gaussian