If a = $7-4\sqrt{3}$ , then the value of $a^{\frac{1}{2}}+a^{-\frac{1}{2}}$ is :

If a = $7-4\sqrt{3}$ , then the value of $a^{\frac{1}{2}}+a^{-\frac{1}{2}}$ is :
1). $3\sqrt{7}$
2). 4
3). 7
4). $2\sqrt{3}$

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