/etc/freeradius/3.0/sites-available/ is in freeradius-config 3.0.12+dfsg-5+deb9u1.
This file is owned by root:root, with mode 0o755.
..
/etc/freeradius/3.0/sites-available/README
/etc/freeradius/3.0/sites-available/abfab-tls
/etc/freeradius/3.0/sites-available/abfab-tr-idp
/etc/freeradius/3.0/sites-available/buffered-sql
/etc/freeradius/3.0/sites-available/challenge
/etc/freeradius/3.0/sites-available/channel_bindings
/etc/freeradius/3.0/sites-available/check-eap-tls
/etc/freeradius/3.0/sites-available/coa
/etc/freeradius/3.0/sites-available/control-socket
/etc/freeradius/3.0/sites-available/copy-acct-to-home-server
/etc/freeradius/3.0/sites-available/decoupled-accounting
/etc/freeradius/3.0/sites-available/default
/etc/freeradius/3.0/sites-available/dhcp
/etc/freeradius/3.0/sites-available/dhcp.relay
/etc/freeradius/3.0/sites-available/dynamic-clients
/etc/freeradius/3.0/sites-available/example
/etc/freeradius/3.0/sites-available/inner-tunnel
/etc/freeradius/3.0/sites-available/originate-coa
/etc/freeradius/3.0/sites-available/proxy-inner-tunnel
/etc/freeradius/3.0/sites-available/robust-proxy-accounting
/etc/freeradius/3.0/sites-available/soh
/etc/freeradius/3.0/sites-available/status
/etc/freeradius/3.0/sites-available/tls
/etc/freeradius/3.0/sites-available/virtual.example.com
/etc/freeradius/3.0/sites-available/vmps