The correct option is
C Both Relation and a function
Using Vertical line test
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1111145/original_1_-_05_1.PNG)
The vertical line cuts the graph at one point therefore the vertical line test is passed.
∴ For one value of
x there is only one different value of
y everytime.
Hence the given graph is a relation as well a function.