As compared to rapid sand filters, slow sand filters give______________?_x005F_x000D_1) slower filtration rate_x005F_x000D_2) higher filtration rate_x005F_x000D_3) lesser efficiency in removal of bacteria_x005F_x000D_4) higher efficiency in removal of bacteria_x005F_x000D_The correct answer is?

As compared to rapid sand filters, slow sand filters give_____________

1.	As compared to rapid sand filters, slow sand filters give______________?_x005F_x000D_1) slower filtration rate_x005F_x000D_2) higher filtration rate_x005F_x000D_3) lesser efficiency in removal of bacteria_x005F_x000D_4) higher efficiency in removal of bacteria_x005F_x000D_The correct answer is?
A.	(1) and (2)
B.	(2) and (3)
C.	(1) and (4)
D.	(2) and (4)
Answer» D. (2) and (4)