Which of the following reactions involves both oxidation and reduction?
- A$H_2 + Br_2 \to 2HBr$
- B$HBr + AgNO_3 \to AgBr + HNO_3$
- C$NaBr + HCl \to NaCl + HBr$
- D$Na_2O + H_2SO_4 \to Na_2SO_4 + H_2O$
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