Suppose the following Solution is presented: B U G — R — /‘? Which of the following is NOT a legal way for an opponent to add symbols of groupings to the Solution in order to prove it wrong? (A) B U (G — R) — /‘ (B) (B U G) — (R — /‘) (C) [(B U G) — R] — /‘ (D) [(B U G) — R — /]’ |