If the graph of relation R is as shown in the above figure, what test can we use to determine if the graph is also that of a function? А
Vertical lines such as line 1 intersect the graph in at most one place.
B
Diagonal lines such as line 2 intersect the graph in at most two places.
Horizontal lines such as line 3 intersect the graph in at most three places.
D
Tangent lines such as line 4 intersect the graph in at most four places.