We have project which verifies pages of Multiple Choice questions using Checkbox groups of 4 answers. Multiple answers are not allowed for a group, but we cannot disallow 'No item selected' because sometimes respondents make no selection.
Our problem is that occasionally a valid a/b/c/d response is read as 'No item selected' and the staff verifying the form do not check properly. Is there a way to force a verifier to select the 'No item selected' option so we know that it has been checked and confirmed, rather than just ignored.
I cannot see any way to do this - am I missing anything?