If the quadrilateral formed by the lines ax + by + c = 0, a'x + b'y + c' = 0, ax + by + c' = 0,a'x + b'y + c = 0 have perpendicular diagonals, then :

Options

A. `b^2 + c^2 = b'^2 + c'^2`
B. `c^2 + a^2 = c'^2 + a'^2`
C. `a^2 + b^2 = a'^2 + b'^2`
D. none of these

Answer

C