Match all items in Group 1 with correct options from those given in Group 2.
Group 1 Group 2
P. Regular expression 1. Syntax analysis
Q. Pushdown automata 2. Code generation
R. Dataflow analysis 3. Lexical analysis
S. Register allocation 4. Code optimization
(A) P-4. Q-1, R-2, S-3
(B) P-3, Q-1, R-4, S-2
(C) P-3, Q-4, R-1, S-2
(D) P-2, Q-1, R-4, S-3
Answer: (B)
Explanation: Regular expressions are used in lexical analysis.
Pushdown automata is related to context free grammar which is related to syntax analysis.
Dataflow analysis is done in code optimization.
Register allocation is done in code generation.
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