Find the Critical Number(s), If Any, of the Function $f ( x ) = e ^ { x ^ { 2 } - 10 x }$

Multiple Choice

Find the critical number(s) , if any, of the function $f ( x ) = e ^ { x ^ { 2 } - 10 x }$ .

A) $\sqrt { 10 }$
B) 5
C) $\sqrt { 10 }$ and $- \sqrt { 10 }$
D) 5 and $- 5$