Question
Which of the following is an amorphous solid
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$(a)$ The moment of inertia of cube about $z-$ axis is $I_z$ = $I_x + I_y$
$(b)$ The moment of inertia of cube about $A-$ axis is $I_A$=${I_z} + \frac{{m{a^2}}}{2}$
$(c)$ The moment of inertia of cube about $B-$ axis is $I_B$=${I_z} + \frac{{m{a^2}}}{2}$
$(d)$ $I_x$ = $I_z$