On What Interval Is the Graph Of $f ( x ) = \left( 1 - \frac { 1 } { x } \right) ^ { 2 }$

On what interval is the graph of $f ( x ) = \left( 1 - \frac { 1 } { x } \right) ^ { 2 }$ concave downward?

A) $( - \infty , 0 )$

B) $\left( \frac { 3 } { 2 } , \infty \right)$
C) $( 0 , \infty )$
D) $( 1 , \infty )$
E) $( - \infty , - 1 )$
F) $\left( 1 , \frac { 3 } { 2 } \right)$

G) $\left( - \frac { 3 } { 2 } , - 1 \right)$

H) $( 0,1 )$

Correct Answer:

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