Match the compiler phase to its description

Question 1 options:

12345	Semantic Analysis
12345	Parser
12345	Code Generation
12345	Scanner
12345	Optimization

1.	Reads in a source program and generates a sequence of tokens.
2.	Reads in a sequence of tokens and uses a context free grammar to build an intermediate representation of the program.
3.	Analyzes the program for correctness.
4.	Improve the program output through various transformations and reductions.
5.	Translates an intermediate representation into a target language.