3. (20 points) Consider the following regular set over = {a,b}. Which of the following correctly represents the language given by S3? (4 points) Explain your answer. (16 points) S3 = {a}+{a,b}+{b}+ 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 b' 4. Set of all strings in * 5. None of the above (provide your own answer and explanation.)