Let A = {x: x is a digit in the number 3591}, B = {x: x ? N, x<10}. Which of the following is false?

 Let A = {x: x is a digit in the number 3591}, B = {x: x ? N, x<10}. Which of the following is false?

A). A? B = {1,3,5,9}

B). A-B = {2,4,6,7,8}

C). A U B = {1,2,3,4,5,6,7,8,9}

D). none of these

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