Which of the following option is true about the moment of inertia of a section?

i) The unit of moment of an area does not depends upon the units of its area.

ii) The moment of inertia of an area may be obtained by the methods of integration.

iii) The Routh`s rule is used in finding out the moment of a body which is unsymmetrical about three mutually perpendicular axes.

The true option is