In addition to the substantive responses we also offer default missing values: invalid, refused and don't know. In the second and third case missing values will be shown only if the respondent will not answer the question.

Question is not mandatory.

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Question is set as mandatory (hard reminder).

Option is turned on: Show the option "Invalid"/"Refused"/"Don't know" on alert

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Question is set as mandatory (soft reminder).

Option is turned on: Show the option "Invalid"/"Refused"/"Don't know" on alert

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