Answer:
The correct option is a.
Step-by-step explanation:
If a function is defined as
[tex]f(x)=\{(x,y):x\in R,y\in R\}[/tex]
then the inverse of the function is
[tex]f^{-1}(x)=\{(y,x):x\in R,y\in R\}[/tex]
We know that the graph of a function and its inverse function symmetrical about the line y=x.
Draw the line of symmetry x=y in each of the given graph.
From the below figure it is clear that only graph 1 is symmetrical about the line y=x.
Therefore the correct option is a.
