The base of a cliff is circular. From the extremities of a diameter of the base,the angles of elevation of the top of the cliff are $30^\circ$ and $60^\circ$. If the height of the cliff is $500 \ m$,then the diameter of the base of the cliff is:
- A$1000 \sqrt{3} \ m$
- B$2000 / \sqrt{3} \ m$
- C$1000 / \sqrt{3} \ m$
- D$2000 \sqrt{2} \ m$
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