Point of contra-flexure is a
(a) Point where Shear force is maximum
(b) Point where Bending moment is maximum
(c) Point where Bending moment is zero
(d) Point where Bending moment=0 but also changes sign from positive to negative
(a) Point where Shear force is maximum
(b) Point where Bending moment is maximum
(c) Point where Bending moment is zero
(d) Point where Bending moment=0 but also changes sign from positive to negative