When $MgSO_4$ reacts with $NH_4OH$ and $Na_2HPO_4$,it forms a white crystalline substance. What is the formula of that substance?
- A$Mg(NH_4)PO_4$
- B$Mg_3(PO_4)_2$
- C$MgCl_2 \cdot MgSO_4$
- D$MgSO_4$
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