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 :
.
A. `(pi)/(12)MR^(2)`
B. `((4)/(3)-(pi)/(4))MR^(2)`
C. `((8)/(3)-(10pi)/(16))MR^(2)`
D. `((4)/(3)-(pi)/(6))MR^(2)`
