Which of the following operating features do displacement pumps bear if they are working under no-cavitation condition?() (1) output is almost directly proportional to speed (2) they are self-priming (3) they will develop a discharged pressure equal to the resistance to be overcome, irrespective of speed
A. (1)and(2)
B. (2)and(3)
C. (1)and(3)
D. (1),(2)and(3)