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Figure shows a uniform solid block of mass \( M \) and edge lengths \( a, b \) and \( c \). Its \( \mathrm{MI} \) about an axis through one edge and perpendicular (as shown) to the large face of the block is
\( \mathrm{P} \)
(1) \( \frac{M}{3}\left(a^{2}+b^{2}\right) \)
(2) \( \frac{M}{4}\left(a^{2}+b^{2}\right) \)
(3) \( \frac{7 M}{12}\left(a^{2}+b^{2}\right) \)
(4) \( \frac{M}{12}\left(a^{2}+b^{2}\right) \)
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