The Bounds M and M Used in the Bounds on an Integral

Multiple Choice

The bounds m and M used in the Bounds on an Integral Theorem for $\int _ { 1 } ^ { 2 } \frac { 1 } { x ^ { 2 } } d x$ are

A) $1,2$
B) $1,4$
C) $2,4$
D) $\frac { 1 } { 2 } , 1$
E) $\frac { 1 } { 4 } , 1$