Find the Largest Open Interval Where the Function Is Changing $\quad \mathrm { y } = \frac { 1 } { \mathrm { x } ^ { 2 } } + 7$

Multiple Choice

Find the largest open interval where the function is changing as requested.
-Decreasing $\quad \mathrm { y } = \frac { 1 } { \mathrm { x } ^ { 2 } } + 7$

A) $( - 7,7 )$
B) $( - 7,0 )$
C) $( 7 , \infty )$
D) $( 0 , \infty )$