Question

define vertex
where the parabola touches or intersects the x-axis
the highest or lowest point on the graph
where parabola line touches or intersects the x- axis, also called the x-intercept
a line that divides the graph into two equal parts. i.e. cuts the graph in half

Explanation:

The vertex of a parabola is its extreme point: the minimum (lowest) point for upward-opening parabolas, or the maximum (highest) point for downward-opening parabolas. The other options describe x-intercepts (points where the parabola meets the x-axis) and the axis of symmetry (the line dividing the parabola into two equal halves).

Answer:

B. The highest or lowest point on the graph