Use the Graph of a Quadratic Function to Find the Solution

Multiple Choice

Use the graph of a quadratic function to find the solution set of the equation or inequality.
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A) $\{1,4\}$
B) $(-\infty, 1) \cup(4, \infty)$
C) $[1,4]$
D) $(-\infty, 1] \cup[4, \infty)$