The simplified form of $\frac{1}{\sqrt{7}+\sqrt{5}}+\frac{1}{\sqrt{12}-\sqrt{5}}+\frac{1}{\sqrt{12}-\sqrt{7}}$ is :

The simplified form of $\frac{1}{\sqrt{7}+\sqrt{5}}+\frac{1}{\sqrt{12}-\sqrt{5}}+\frac{1}{\sqrt{12}-\sqrt{7}}$ is :
1). 5
2). 2
3). 1
4). 0

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