Which of the following derivations does a top-down parser use while parsing an input string? The input is assumed to be scanned in left to right order.
  • a)
    Leftmost derivation
  • b)
    Leftmost derivation traced out in reverse
  • c)
    Rightmost derivation
  • d)
    Rightmost derivation traced out in reverse
Correct answer is option 'A'. Can you explain this answer?
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