Two circles of radii $10\text{ cm}$ and $6\text{ cm}$ touch each other externally. What is the length of their direct common tangent?
Options:
- A: $4\sqrt{15}\text{ cm}$
- B: $8\sqrt{3}\text{ cm}$
- C: $12\text{ cm}$
- D: $15\text{ cm}$
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