Answer:
the domain is all real numbers.
D is the correct option.
Explanation:
Domain is the set of x values for which the function is defined.
Hence, in order to find the domain, we see the values of x in the given graph.
We can see that in the given graph that x lies between negative infinity to positive infinity.
And the x values gives us the domain of the graph.
Thus, the domain is all real numbers.
D is the correct option.