Which of the following choices could be equal to set Z if X = {2,5,6,7,9} and Y

Which of the following choices could be equal to set Z if

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X = {2,5,6,7,9} and Y = {2,5,7} XUYUZ = {1,2,3,4,5,6,7,8,9} xnz = {2,6} yn z = {2} A. Z= {1,4,8} B. Z= {1,3,8} C. Z= {1,3,4,8} D. Z= {1,2,3,4,6,8} E. Z= {1,2,3,5,6,8}