Two point masses of $0.3\, kg$ and $0.7\, kg$ are fixed at the ends of a rod of length $1.4\, m$ and of negligible mass. The rod is set rotating about an axis perpendicular to its length with a uniform angular speed. The point on the rod through which the axis should pass in order that the work required for rotation of the rod is minimum is located at a distance of
- A$0.4\, m$ from mass of $0.3\, kg$
- B$0.98\, m$ from mass of $0.3\, kg$
- C$0.70\, m$ from mass of $0.7\, kg$
- D$0.98\, m$ from mass of $0.7\, kg$
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