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Given the $\overset { \rightharpoonup }{ AB } \;$ (vector AB) with its initial point at $\left( 2,5 \right)$ and its terminal point at $\left( 7,17 \right)$, what is the $\left\| AB \right\|\;$ (magnitude AB) of the vector?

A

$\sqrt { 229 }$

B

$-13$

C

$13$

D

$-\sqrt { 229 }$

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