Which graph shows a quadratic function with a discriminant value of 0?
A
[Image: On a coordinate plane, a parabola opens up. It goe...]B
[Image: On a coordinate plane, a parabola opens down. It g...]C
[Image: On a coordinate plane, a parabola opens up. It goe...]D
[Image: On a coordinate plane, a parabola opens up. It goe...]