solve fast

QUESTIONS Which relations are partial order? A=(5,6,8,10,20) and R={(a,b) EA* A: a divides b} Let A=(1,5,6,8,10) = and R={(1,1). (5,5), (8,8), (10,10), (1,5), (5:6), (1.6). (6.6) None of the propsed relations Let A={1,5,6,8,103 and R={(1,1). (5.5). (8,8). (10,10), (1,5). (5.6), (1,6).(6,81}