2. (20 points) Consider the following regular set over = {a,b}. Which of the following correctly represents the language given by S,? (4 points) Explain your answer. (16 points) S2 = {a}+{a,b} {0}+ 1. Set of all strings that start with 'a' 2. Set of all strings that end with 'b' 3. Set of all strings that start with 'a' and end with ** 4. Set of all strings in * 5. None of the above (provide your own answer and explanation.)