Question2 Which one of the following is not an example of two sets S and T of strings such that S T S, but S*-T"? T and 1. S (a b abb) and T (a b bba) 2 s-(a aaaa) and T {a aaa) 3. S (a ab, aab) and T (a ab abab) 4. S (a b aaa) and T (a b bbb)