What does the 'E' button do in an Audi A2?

I've noticed an 'E' button on my Audi A2's dash, but I have no idea what it does. Can someone explain its function?

The 'E' button stands for economy mode and it helps improve fuel efficiency by optimizing the car's performance and reducing power consumption. It's especially useful for city driving.

The 'E' button activates the car's electric mode, allowing it to run entirely on electricity for a short distance. This can be useful in heavy traffic or when driving in a low emission zone.

The 'E' button is actually an emergency button and it automatically alerts the nearest Audi service center in case of an accident or breakdown. It's an added safety feature for Audi drivers.