Which of the following statements is correct regarding $H_3PO_3$ and $H_3PO_4$?
- A$H_3PO_3$ is dibasic and a reducing agent.
- B$H_3PO_3$ is dibasic and not a reducing agent.
- C$H_3PO_4$ is tribasic and a reducing agent.
- D$H_3PO_3$ is tribasic and not a reducing agent.
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