Autocheck exclusive option
From LimeSurvey Manual
Auto-check exclusive option if all others are checked (autocheck_exclusive_option)
If a participant checks all the answer options, you can use this attribute to un-check the respective options and auto-check one single option. The ID of the auto-check answer option has to be typed in the exclusive option attribute.
Note that the answer options are seen as subquestions in the response table. If a user checks a subquestion, then the answer registered in the response table is "Yes [Y]" (otherwise, "No [N]").
- Off (default)
Let's suppose you offer the following five answer options: "A", "B", "C", "D", and "all the above". As a researcher, you will not like a respondent to check all the possible answer options from the list. Therefore, in order to prevent this, you may activate this attribute so that only one answer is registered in the response table ("all the above" answer in this case). To activate it, type in the exclusive option box the id of the "all the above" subquestion.