Use Interval Notation to Write the Intervals Over Which F $( - 4 , \infty )$

Use interval notation to write the intervals over which f is (a) increasing, (b) decreasing, and (c) constant.
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A) a. $( - 4 , \infty )$
b. $( - \infty , - 4 )$
c. never constant

B) a. never increasing
b. $( - \infty , - 2 ) \cup ( 2 , \infty )$
c. $( - 2,2 )$

C) a. $( - \infty , - 2 ) \cup ( 2 , \infty )$
b. never decreasing
c. $( - 2,2 )$

D) a. $( - \infty , 2 ) \cup ( 2 , \infty )$
b. never decreasing
c. $( - 2,2 )$