Consider the following two sets:
| List I | List II |
|---|---|
| P. Lexical Analyzer | 1. Abstract Syntax Tree |
| Q. Syntax Analyzer | 2. Token |
| R. Intermediate Code Generator | 3. Parse Tree |
| S. Code Optimizer | 4. Constant Folding |
Which one of the following options is the CORRECT match from Set X to Set Y?