C-02-Q080mediumsingle_mcqWhich pair of sets is disjoint?a{1,2}\{1, 2\}{1,2} and {2,3}\{2, 3\}{2,3}b{a,b}\{a, b\}{a,b} and {c,d}\{c, d\}{c,d}c{1,2}\{1, 2\}{1,2} and {1}\{1\}{1}d{x,y}\{x, y\}{x,y} and {y}\{y\}{y}