Ambulance on roundabout

An image of a roundabout with the CBR white car on it (between the first and second exit) and an ambulance with the priority signals on (sound and blue flash) entering the roundabout.
The question is: “What should you do in this case?”
The options are:
-Stop immediately
-Exit the roundabout in the first exit possible
-Keep driving in the roundabout until the emergency vehicle has exit

You can find the correct answer in our e-book. For now, you may think about the correct answer yourself