Four holes of radius `R` are cut from a thin square plate of side `4 R` and mass `M`. The moment of inertia of the remaining portion about z-axis is :
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A concentric hole of radius R/2 is cut from a thin circular plate of mass M and radius R. The moment of inertia of the remaining plate about its axis will be

A concentric hole of radius R/2 is cut from a thin circular plate of mass M and radius R. The moment of inertia of the remaining plate about its axis will be

A concentric hole of radius R/2 is cut from a thin circular plate of mass M and radius R. The moment of inertia of the remaining plate about its axis will be

A hole of radius R//2 is removed from a thin circular plate of radius R and mass M. The moment of inertia of the remaining plate about an axis through centre O and perpendicular to the plane of the plate is

A hole of radius R//2 is removed from a thin circular plate of radius R and mass M. The moment of inertia of the remaining plate about an axis through centre O and perpendicular to the plane of the plate is