Determine the Largest Open Intervals of the Domain Over Which $( 1 , \infty )$

Determine the largest open intervals of the domain over which the function is increasing, decreasing, and constant.
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A) Increasing $( 1 , \infty )$ ; Decreasing $( - \infty , 1 )$
B) Increasing $( - \infty , - 1 )$ ; Decreasing $( - 1 , \infty )$
C) Increasing $( - \infty , 1 )$ ; Decreasing $( 1 , \infty )$
D) Increasing $( - 1 , \infty )$ ; Decreasing $( - \infty , - 1 )$