In $\triangle ABC$, $AD$ is the angle bisector of $\angle A$ meeting $BC$ at $D$. If $AB = 10\text{ cm}$, $AC = 14\text{ cm}$, and $BC = 12\text{ cm}$, find the length of $BD$.

Options:

• A: 5 cm
• B: 7 cm
• C: 6 cm
• D: 4 cm

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