How can I check what scripts are in Nmap’s default category (`–script=default`)?

I know that the -sC and -A options run the “default” category of scripts (--script=default):

https://nmap.org/book/nse-usage.html

I’ve searched the nmap script folder for a default sub-folder, but cannot seem to find any.

How can I see what scripts are included in the different categories of nmap scripts?