Some additional places for folks to look if you want to dig further on your own:

Here is a report on these data which includes a facsimile of the original questions in the original survey instrument: https://nces.ed.gov/pubs2020/2020441.pdf

The codebook is also a good place to look for a better understanding:

https://nces.ed.gov/datalab/codebooks/by-subject/134-baccalaureate-and-beyond-2016-2017