Which relations are partial order? 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)} A={5,6,8,10,20} and R={ (a,b) E AXA; a divides b} None of the propsed relations Let A={1,5,6,8,10} and R={(1,1),(5,5), (8,8), (10,10), (1,5), (5,6), (1,6),(6,8)}