No, the Audi A4 is not approved for flat towing. Flat towing is a method of towing a vehicle with all four wheels on the ground. Vehicles approved for flat towing must be able to lubricate the transmission through the driveshaft from the wheels. The Audi A4 is not capable of this, so flat towing could cause damage to the transmission.
If you need to tow an Audi A4, you will need to use a trailer or dolly.