Sis the set of prime numbers that are less than 15.. a) 2,3,5,7,11,13. b)2,3,5,7,9,11,13. c)1,3,5,7,9,11,13. d)1,2,3,4,5,6,7,8,9,10,11,12,12,14, 15. for questions 4& 5 suppose u=1,2,3,4,5,6,7,8 a=1,3,5,7 b=4,5,6. tell whether each statement is true or false.. a subset b. true . false. b subset u . true . false