Please help if you understand this
Which is the graph of the identity function

Please check the explanation.

Step-by-step explanation:

The function is called the identity function.

In other words, x GOES IN, X COMES OUT.

From all the graphs, the 3rd graph represents the identity function as the input and output of this graph remains the same.

The 3rd graph indicates that:

So, it is clear that input and output of this 3rd graph remains the same.

The solution graph is also attached below.

e.

step-by-step explanation:

because there are always 10 numbers in a phone number.