Use Interval Notation to Describe the Interval of Real Numbers $( - \infty , 5 ]$

Multiple Choice

Use interval notation to describe the interval of real numbers.
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A) $( - \infty , 5 ]$
B) $( 5 , - \infty )$
C) $( - \infty , 5 )$
D) $[ 5 , \infty$ )