Let a,b,c e Z. Which propositions are true? a. (2 a 16 a) 12 a b. (a | b 1 bc) = (2a +b)|c 45 a = 10 2a d. (a | b A a) alb-c) e. (2 a 1 5a) 10 | a of (ab A a C) 2a (6+c) &a | bc = (a | b V aC) h.51 a 52a e