-db {conda,mamba,virtualenv,venv,uv,none}, --default-venv-backend {conda,mamba,virtualenv,venv,uv,none}
                        Virtual environment backend to use by default for Nox sessions, this is ``'virtualenv'`` by default but any of ``{list(ALL_VENVS)!r}`` are accepted.
  -fb {conda,mamba,virtualenv,venv,uv,none}, --force-venv-backend {conda,mamba,virtualenv,venv,uv,none}
                        Virtual environment backend to force-use for all Nox sessions in this run, overriding any other venv backend declared in the Noxfile and ignoring the default backend. Any of ``{list(ALL_VENVS)!r}`` are accepted.