3. The following table lists the probability function of the discrete variables (X, Y). Known that event {X=0} is independent with event {X+Y=1}. Which choice is true? () A. a = 0.2, b=0.3 C. a = 0.3, b=0.2 B. a = 0.4, b= 0.1 D. a = 0.1, b = 0.4 X 0 1 Y 0 0.4 b 1 a 0.1

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