SCORM2004 Reporting2.0 in Cornerstone: Meaning of slide numbers?

I’m working with a Storyline-built Scorm2004 course in Cornerstone and have questions around the numbers that Reporting 20.0 adds to the names of slides in the Question ID column. I’m seeing the following data in a report:
Scene4_Slide3_MultiChoice_0_0
Scene4_Slide3_MultiChoice_0_1
Scene4_Slide3_MultiChoice_0_2
Scene4_Slide3_MultiChoice_0_3
Scene4_Slide3_MultiChoice_0_4
Scene4_Slide3_MultiChoice_1_0

My understanding is that in the line: “Scene4_Slide3_MultiChoice_0_1”, the zero refers to a first attempt at the quiz, but what does the “1” at the end of the line refer to?

Thanks