Discussion
A parse tree differs from a derivation in that the parse tree
Answer: D
Correct answer: does not record the order in which the nonterminals were expanded
The parse tree captures the structure and discards the sequence, so the leftmost and rightmost derivations of one sentence produce the same tree. That is precisely what makes the tree the right object: the order of expansion is an artefact of the derivation process, while the structure is what the sentence means.
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