Given the following syntax directed translation rules: Rule 1: 𝑅 → 𝐴𝐵 {𝐵.…

Final classification (correct answer): Rule 1 is neither S-attributed nor L-attributed; Rule 2 is not S-attributed and is L-attributed; Rule 3 is S-attributed and L-attributed.

Key reasons:

• Rule 1: This rule is neither S-attributed nor L-attributed. It is not S-attributed because the semantic action uses R.i to set B.i before R.i itself is computed for the left-hand side, so the production requires an inherited value for R.i (S-attributed grammars allow only synthesized attributes). It is not L-attributed because A.i is assigned from B.i (a right sibling). L-attributed inherited attributes of a symbol may depend only on the parent and on attributes of symbols to its left, so depending on a right sibling violates the L-attributed restriction.

• Rule 2: This rule is L-attributed but not S-attributed. The attribute D.i for the right child is assigned from C.i (the left sibling), so D.i is an inherited attribute that depends only on a left sibling, which fits the L-attributed form. Because an inherited attribute is present (D.i), the production is not S-attributed (S-attributed grammars permit only synthesized attributes).

• Rule 3: This rule is S-attributed because the parent attribute Q.i is computed solely from the synthesized attributes E.i and F.i of its children. Since it is S-attributed (only synthesized attributes used), it also satisfies the requirements for being L-attributed.

Therefore, the option that states: "Rule 1 is neither S-attributed nor L-attributed; Rule 2 is not S-attributed and is L-attributed; Rule 3 is S-attributed and L-attributed" is the correct choice.