已知U={1,2,3,4,5,6,7,8},A={1,3,5,7},B={2,4,5},则Cu（AUB）等于?

题目

已知U={1,2,3,4,5,6,7,8},A={1,3,5,7},B={2,4,5},则Cu（AUB）等于?
A{6,8} B{5,7} C{4,6,7} D{1,3,5,6,8}

答案

{6,8}