If you'd look those up on google you'd find the answer, although I'm not sure which would be LUX, but I'd expect they mean either Cargolux or Luxair, THY is Turkish Airlines, DLH is Lufthansa (Deutsche Lufthansa for clarification haha). As Eurowings is part of Lufthansa, I'd go with the latter. Also only do part A if you haven't done the DLR before.