Quiz submission data

[mlewis23]

In the quiz submission data there is a work_flow field (Quiz Submissions - Canvas LMS REST API Documentation). 

The possible data returned for this field is: ['untaken'|'pending_review'|'complete'|'settings_only'|'preview']

Does anyone know what causes the 'settings_only'?  Is this tracking if a student goes to the quiz page but DOES NOT click the 'Take' button?

[mlewis23]

Correction: the field in question is titled 'workflow_state' not 'work_flow'.