In a comparison between ball valves and butterfly valves in the same water system application, the valve that would typically be more leak-tight when fully closed with a high differential pressure is the __________ valve; and the valve that typically results in the greater pressure decrease when fully open is the __________ valve.
A. ball; butterfly
B. ball; ball
C. butterfly; butterfly
D. butterfly; ball
Share your understanding of this question with the correct explanation.