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Which of the following derivations does a top-down parser use while parsing an input string?

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Which of the following derivations does a top-down parser use while parsing an input string?

(a) Leftmost derivation

(b) Leftmost derivation  in reverse

(c) Rightmost derivation

(d) Rightmost derivation in reverse

I had been asked this question during an interview.

This question is from Top-Down Parsing topic in portion Topdown Parsing of Compiler

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Best answer
Right option is (a) Leftmost derivation

The best explanation: In top down parser takes input from Left to right constructing leftmost derivation of the sentence.

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