Balance the following chemical equation in acid:
Bro₃⁻+N₂H₄→Br⁻+N₂

a. Bro₃⁻+3N₂H₄→Br⁻+3N₂
b. Bro₃⁻+2N₂H₄→Br⁻+2N₂
c. Bro₃⁻+4N₂H₄→Br⁻+4N₂
d. Bro₃⁻+N₂H₄→Br⁻+2N₂

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