Which of the Following Is NOT a Basic Rule for Questionnaire

Which of the following is NOT a basic rule for questionnaire coding?

A) Every closed-ended question should have a code number associated with every possible response.
B) Use single-digit code numbers, beginning with "1," incrementing them by one and using the logical direction of the response scale.
C) Use the same coding system for questions with identical response options regardless of where these questions are positioned in the questionnaire.
D) Remember that a "check all that apply" question is simply a special case of a "yes" or "no" question, so use a "1" (="yes") and "0" (="no") coding system. You will want to consider each concept being tested as a separate question.
E) When possible, set up the coding system as soon as possible after the questionnaire is finalized.