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NIELIT 2016 DEC Scientist B (CS) - Section B: 57

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Lexical analyser uses the regular expressions as defined by the language specification to output a set of tokens for the synatax analyser whose output is a systax tree after matching the syntax.

So, answer is D.

Option B is not wrong as each token can be considered a string of tokens, but D is a better choice.
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Output of Lexical analyzer is set of tokens

So D is correct.
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Lexical analyzer scans whole source program character by character and produces the set of tokens

So the answer is D
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