Find the circumference and the area of a circle with diameter $42 \, cm$.
- A$132 \, cm, 1386 \, cm^2$
- B$132 \, cm, 693 \, cm^2$
- C$264 \, cm, 1386 \, cm^2$
- D$66 \, cm, 693 \, cm^2$
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