The correct statement(s) related to oxoacids of phosphorous is(are)

A

Upon heating, H3PO3 undergoes disproportionation reaction to produce $$H_3PO_4$$ and $$PH_3$$.

B

While $$H_3PO_3$$ can act as reducing agent, $$H_3PO_4$$ cannot.

C

$$H_3PO_3$$ is a monobasic acid.

D

The H atom of P-H bond in $$H_3PO_3$$ is not ionizable in water.