Discussion
Bottom up parsing traces out
Answer: B
Correct answer: the steps of a rightmost derivation taken backwards
A bottom up parser starts from the input and works towards the start symbol, so the reductions it performs are the derivation steps run in reverse. Because the handle is always the leftmost complete right side available, the derivation being reversed is specifically the rightmost one - which is why the method is also called LR, for left-to-right scan of a rightmost derivation in reverse.
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