OBD2 Connector Audi A3, 2001

Hi, does anyone know if the OBD2 diagnostic connector on an Audi A3 from 2001 requires a K-line or a dual K-line? In total, 5 pins are connected on the vehicle side: pins 1, 4, 5, 7, and 16. Thank you very much.

Just a single K-line.

-Uwe-