Answer:
S-shaped curve is the function .
Explanation:
Given:
Four graphical representation.
The diagrams are :
Parabola (opening on x-axis).
Straight line (parallel to y-axis).
Circle (at the origin).
A S-shaped curve (at the origin).
For a relation to be function we will follow the vertical line test:
Note:
The vertical line test says that a relation is a function if a vertical (up and down) line drawn,passes through the graph or cut across it only at one point.
Parabola (opening on x-axis),Straight line (parallel to y-axis) and the Circle (at the origin) fails this test.
An image is attached with.
So the S-shaped curve is the function.