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Which equation corresponds to a parabola that opens upward with a vertex at (0,−4)(0, -4)(0,−4)?
y=x2−4y = x^2 - 4y=x2−4
y=−x2−4y = -x^2 - 4y=−x2−4
y=(x−4)2y = (x - 4)^2y=(x−4)2
y=x2+4y = x^2 + 4y=x2+4