The diagram depicts a uniform rod whose midpoint is supported by a pivot. Two weights $X$ and $Y$ are suspended from the rod. The rod is balanced in equilibrium. Which statement is correct?
- AThe forces at $X$ and $Y$ have different values.
- BThere is a resultant turning effect on the rod.
- CThe resultant force on the rod is zero.
- DThe rod does not have a centre of mass.