Answer: The correct option is 2.
Explanation:
If the graph satisfies the vertical line test then it a graph of a function.
According to the vertical line test the graph of the function intersects all vertical line at most once. If a graph intersects any vertical line more that one time then it is nt the graph of a function.
Reason correct option:
Only the graph 2 passes the vertical line test therefore the correct option is 2.
Reason for incorrect option:
In figure 1 the graph intersects the vertical lines x=-2 and x=0 two times, therefore the graph does not pass the vertical line test.
In figure 3 the graph intersects the vertical line x=4 two times, therefore the graph does not pass the vertical line test.
In figure 4 the graph intersects the vertical line x=2 two times, therefore the graph does not pass the vertical line test.
Therefore the option 1,3 and 4 are incorrect.
