Determine the Intervals of the Domain Over Which the Function $P(-1,-3)$

Determine the intervals of the domain over which the function is continuous.
- $P(-1,-3)$

A) $( - \infty , - 3 ) \cup ( - 3 , \infty )$
B) $( - \infty , - 1 ] \cup [ - 1 , \infty )$
C) $( - \infty , - 1 ) \cup ( - 1 , \infty )$
D) $( - \infty , \infty )$