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Two heavenly bodies s1 & s2 not far off ...

Two heavenly bodies `s_1 & s_2` not far off from each other, revolve in orbit

A

Around their common centre of mass

B

Which are arbitrary

C

With `S_(1)` fixed and `S_(2)` moving round `S_(1)`

D

With `S_(2)` fixed and `S_(1)` moving round `S_(2)`

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The correct Answer is:
A
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