Find the Exact Location of All the Relative and Absolute $f ( x ) = \frac { 8 } { x } - \frac { 4 } { x ^ { 2 } }$

Multiple Choice

Find the exact location of all the relative and absolute maxima of the function. $f ( x ) = \frac { 8 } { x } - \frac { 4 } { x ^ { 2 } }$
Select all correct answers.

A) $( 1 , - 4 )$ - absolute maximum
B) $( 4 , - 8 )$ - absolute minimum
C) $( - 1,8 )$ - relative maximum
D) $( 1,4 )$ - absolute minimum
E) $( 1,4 )$ - absolute maximum