Final test: Server security

One correct answer

In the PostgreSQL conf.d you replaced listen_addresses = '*' with 'localhost' and ran sudo systemctl reload postgresql. What will ss -tln 'sport = :5432' show?

• A 127.0.0.1:5432.
• B 0.0.0.0:5432 and [::]:5432, as before.
• C Nothing — the database stopped to change the address.