Which of the following statements are true if one mole of $$\mathrm{H_3PO_x}$$ is completely neutralized by $$40\,\mathrm{g}$$ of $$\mathrm{NaOH}$$?

A

$$x=2$$ and the acid is monobasic

B

$$x=3$$ and the acid is dibasic

C

$$x=4$$ and the acid is tribasic

D

$$x=2$$ and the acid does not form an acid salt