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If `' O '` is the circum centre of the ` A B C` and `R_1,\ R_2,\ R_3` are the radii of the circumcircle of triangle `O B C ,\ O C A\ a n d\ O A B` respectively then `a/(R_1)+b/(R_2)+c/(R_3)` has the value equal to `(a b c)/(2R^3)` (b) `(R^3)/(a b c)` (c) `(4)/(R^2)` (d) `(a b c)/(R^3)`

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