C-02-Q050mediumsingle_mcqA={3,5,7}A = \{3, 5, 7\}A={3,5,7}, B={5,3,3,7}B = \{5, 3, 3, 7\}B={5,3,3,7}, C={7,7,3,5,5}C = \{7, 7, 3, 5, 5\}C={7,7,3,5,5}. Which is true?aA≠BA \ne BA=BbB≠CB \ne CB=