All of the following are basic rules for questionnaire coding EXCEPT:
a. Use single-digit code numbers, beginning with "1," incrementing them by 1, and using the logical direction of the response scale.
b. Remember that a "check all that apply" question is just a special case of a "yes" or "no" question, so use a "1" ("yes") and "0" ("no") coding system.
c. Use the same coding system for questions with identical response options regardless of where these questions are positioned in the questionnaire.
d. Whenever possible, set up the coding system before the questionnaire is finalized.
e. Opened-ended questions should have code numbers associated with every possible response
Answer: e. Opened-ended questions should have code numbers associated with every possible response