Select the correct statement(s) for `(NH_(4))_(3)PO_(4)`
A. Ratio of number of oxygen atoms to number of hydrogen atoms is 1:3
B. Ratio of number of cations to number of anions is 3:1
C. Ratio of number of gm-atoms of nitrogen to gm-atoms of oxygen is 3:2
D. Total number of atoms in one mole of `(MH_(4))_(3)PO_(4)` is 20.
