Express the given interval in set builder notation and graph.
$(-\infty ,0]$

• A. {$x\(\left\)|x\(\right\).$ ≤ 0}
• B. {$x\(\left\)|x\(\right\).$ < 0}
• C. {$x\(\left\)|x\(\right\).$ > 0}
• D. $\(\left\[\lbrace\) x|x\(\ge\)0\(\right\]\rbrace\)$

Answer: (A)