How can I make a response option exclusive?
In some cases, in a multiple choice question (Check All that Apply) -- an exclusive option ("I dont know" or "None of the Above") may be presented. In such cases you can mark those options as "Exclusive" options. This will enable the engine to validate if the respondent chooses that option - NO OTHER OPTION can be selected.
On the survey if respondents select the None of the above option, they will not be able to select any of the other options.