The verified answer to “In a certain code, DREAM is written as GUHDP. How will NEST be written in that code?” is QHVW, option D. The source working states: Correct answer: QHVW (Option A). Apply the same unchanged rule to NEST: N→Q, E→H, S→V, T→W. Therefore the required code is QHVW. Wrong options: OFTU is wrong because it does not reproduce the verified rule at every position; PGUV is wrong because it does not reproduce the verified rule at every position; MDRS is wrong because it does not reproduce the verified rule at every position. Even one mismatched position invalidates a code, so only Option A is correct. This observation must be confirmed across every available letter position or every consecutive term before it is applied to the missing code. Applying the verified rule to the target expression produces QHVW. The alternatives OFTU, PGUV and MDRS fail because at least one position does not obey the same transformation. A useful final check is to map QHVW backward through the inverse operation and confirm that the original target is recovered.