Correct option is C
For
two-way shear (punching shear), the
critical section is located at a distance of
d/2d/2d/2 from the
face of the column. This is the point where the footing is most vulnerable to shear failure due to concentrated loading from the column.
This provision is in accordance with design codes such as
IS 456:2000, which specifies this location to ensure that the structure is designed for adequate resistance against punching shear failure.
