Which of the following graphs show a function which is one-to-one? Select all correct answers. A. A coordinate plane has a horizontal x-axis and vertical y-axis. A parabola that opens upward has its vertex in quadrant 4, and crosses the negative y-axis, the negative x-axis, and the positive x-axis. B. A coordinate plane has a horizontal x-axis and vertical y-axis. A line falls from left to right to quadrant 4 through the origin. C. A coordinate plane has a horizontal x-axis and a vertical y-axis. An Upper v-shaped graph that opens upward has its vertex on the positive x-axis and crosses the positive y-axis. D. A coordinate plane has a horizontal x-axis and a vertical y-axis. A curve rises steeply in quadrant 4, and then rises shallowly in quadrant 4. As x increases towards positive infinity, the curve approaches the positive x-axis from below.