When do you have to switch on your dipped headlights?

You are correct in selecting all three options. According to German traffic rules, dipped headlights must be switched on during twilight (when natural light is dim but not fully dark) to ensure that your vehicle is visible to others. They are also required when it is dark, providing necessary illumination of the road and improving safety. Additionally, even during daytime, you must switch on dipped headlights when driving through tunnels because tunnels are often dark and can reduce visibility for both you and other drivers. This rule helps prevent accidents by making your vehicle more noticeable in low-light conditions. By following these rules, you ensure compliance and safer driving in varying light conditions.