Which physical shape has the following moment of inertia formula $\frac{1}{2} m(r_2^2 + r_1^2)$?

A. hollow sphere with inside radius $r_1$ and outside radius $r_2$
B. slender bar of length $r_1$ and width $r_2$
C. hollow hemisphere with inside radius $r_1$ and outside radius $r_2$
D. cylinder with inside radius $r_1$ and outside radius $r_2$
E. an ellipse with major axis $r_2$ and minor axis $r_1$