2. The notation {f(x) : x ( S} means "the set of all values that can be produced by substituting an element r of set S into f(x)." For example, the set of all odd integers can be expressed as {2k + 1 : kez}. Let A and B be sets defined as follows: A = {12m - 17 : me Z} B = {4n +7 : nez} (a) (1 point) List any three elements of A. (b) (1 point) List any three elements of B. (c) (3 points) Prove that A C B. Use the definition of subset: A C B if every element of A is also an element of B