What must you be aware of here?

Your answer is correct because in Germany, when approaching a roundabout with a "Yield" sign and the roundabout sign, you must reduce speed and give right of way to vehicles already circulating inside the roundabout. Continuing to brake helps you slow down sufficiently to safely yield if needed.

The third option, indicating when entering the roundabout, is not required in Germany. Drivers only signal when exiting the roundabout, not when entering it. This rule helps clarify intentions to other road users and prevents confusion.

Remember, always watch for vehicles inside the roundabout and be prepared to stop or slow down accordingly. This ensures smooth and safe traffic flow.