I have a new install of Debian 12 Bookworm, and I have added the nonfree firmware sources to my sources list.

However, when I run apt search firmware-linux I see three options

firmware-linux

firmware-linux-free [installed, automatic]

firmware-linux-nonfree

I would like to use nonfree firmware, but I am confused by that first option. what does firmware-linux include or not include that is different from firmware-linux-nonfree? Which should I install?