Meanwhile, Poetsch worked in the background, ensuring that Volkswagen Group had the financial means to absorb bold acquisitions masterminded by his fellow Austrian, Piech, such as the purchase of truck makers MAN and Scania , sportscar maker Porsche and motorbike maker Ducati .
Analyze the relationship between 'Volkswagen Group' and 'Porsche' within the context of the input sentence.
Options: subsidiary, currency, founded by, manufacturer