The verified answer to “In a certain code, APPLE is written as BQQMF. How will CODE be written in that code?” is DPEF, option D. The source working states: Correct answer: DPEF (Option A). Apply the same unchanged rule to CODE: C→D, O→P, D→E, E→F. Therefore the required code is DPEF. Wrong options: EQFG is wrong because it does not reproduce the verified rule at every position; BNCD is wrong because it does not reproduce the verified rule at every position; AMBC 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 DPEF. The alternatives EQFG, BNCD and AMBC fail because at least one position does not obey the same transformation. A useful final check is to map DPEF backward through the inverse operation and confirm that the original target is recovered.