Discussion
An expression grammar is made to reflect operator precedence by
Answer: A
Correct answer: introducing one nonterminal level per precedence level
Each level of the hierarchy - expression, term, factor - corresponds to one precedence level, and because a lower level can only be reached through a higher one, the tighter-binding operators end up deeper in the tree. Associativity follows from whether the recursion is on the left or the right of the production.
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