Discussion
Assertion (A): A bottom-up parser traces out a rightmost derivation in reverse.
Reason (R): Each reduction replaces a right side by its left side, undoing the last step of that derivation.
Answer: B
Both are true and the reason gives the mechanism, and this is why the handle is always the leftmost complete right side. Reversing the sequence of reductions yields a rightmost derivation of the input from the start symbol.
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