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Which of the following correctly defines Top-Down parser?

22. Which of the following correctly defines Top-Down parser?

1. Top-Down Parser starts parsing the tree from the start symbol, constructing the tree up to the input symbol
2. Top-Down Parser starts parsing from the input symbol and constructs the tree up to the start symbol
3. Both of the above
4. None of the above

Answer

The correct answer is: A) Top-Down Parser starts parsing the tree from the start symbol, constructing the tree up to the input symbol

Explanation

Top-Down Parser starts parsing the tree from the start symbol, constructing the tree up to the input symbol. Top-Down parser uses a recursive procedure to process the inputs.