On charging the lead storage battery,the oxidation state of lead changes from $x_1$ to $y_1$ at the anode and from $x_2$ to $y_2$ at the cathode. The values of $x_1, y_1, x_2, y_2$ are respectively $:$
- A$+4, +2, 0, +2$
- B$+2, 0, +2, +4$
- C$0, +2, +4, +2$
- D$+2, 0, 0, +4$
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