MTV u are right, I have seen both answers if my memory is good.
When I see pump somewhere in the answer, I choose pump even if there is no logic in these JAA exams.
Once again, these JAA quizz are a big joke. You just have to learn the 100-300 questions for each paper to guaranty a pass.
So please, stop to tell me that these exams are bloody hard.
Even the NASA have sent a monkey in the space.