2002 Volkswagen jetta rack pinion or pump on 2002 Volkswagen Jetta

My mechanic told me steering pump seized up but then said it was rack and pinion. Now someone else is saying its rare for them to go out and he thinks I should just replace the pump. Could anyone tell me how to differentiate between the pump and rack pinion? Thanks so much

Asked by for the 2002 Volkswagen Jetta