From each corner of square sheet of side \( 8 \mathrm{~cm} \), a square of side \( r \) is cut. ...

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From each corner of square sheet of side \( 8 \mathrm{~cm} \), a square of side \( r \) is cut. The remaining sheet is folded into cuboid. The minimum possible volume of cuboid formed is \( \mathrm{M} \mathrm{cm}{ }^{3} \). If \( \mathrm{r} \) is an integer. then find M.
a. 12
b. 10
c. 4
d. 8
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