Seven identical circular planar disks, each of mass M and radius R are welded symmetrically as shown. The moment of inertia of the arrangement about the axis normal to the plane and passing through the point P is :<br>

Question

( A ) $\frac{73}{2} MR^2$
( B ) $\frac{19}{2} MR^2$
( C ) $\frac{55}{2} MR^2$
( D ) $\frac{181}{2} MR^2$