Choose the Equation That Matches the Graph $y ^ { 2 } = 4 x$

Choose the equation that matches the graph.
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A) $y ^ { 2 } = 4 x$
B) $x ^ { 2 } = 4 y$
C) $y ^ { 2 } = - 4 x$
D) $4 y ^ { 2 } = x$