问题详情

Which property does R possess？ () let A={1,2,3,4} and let R ={＜1,2＞,＜2,2＞,＜3,4＞,＜4,1＞,＜4,2＞}
A．symmetry
B．antisymmetry
C．asymmetry
D．reflexivity请帮忙给出正确答案和分析，谢谢！