Two vectors $\vec{A}$ and $\vec{B}$ have magnitudes $3 \text{ units}$ and $4 \text{ units}$ respectively. If the angle between them is $60^{\circ}$,find the magnitude of their resultant vector.
- A$5 \text{ units}$
- B$7 \text{ units}$
- C$\sqrt{37} \text{ units}$
- D$\sqrt{13} \text{ units}$
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