Determine the Intervals of the Domain Over Which the Function $( - \infty , 1 ) \cup ( 1 , \infty )$

Multiple Choice

Determine the intervals of the domain over which the function is continuous.
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A) $( - \infty , 1 ) \cup ( 1 , \infty )$
B) $( - \infty , \infty )$
C) $[ 4 , \infty )$
D) $( - \infty , 4 ) \cup ( 4 , \infty )$