the third statement is correct
The domain of the graph is all real numbers less than or equal to 0
Note that [tex]\sqrt{-1}[/tex] is not real and so the value inside the square root must be positive or 0
f(- 1 ) = [tex]\sqrt{1}[/tex] = 1 which is real
f(- 4 ) = [tex]\sqrt{4}[/tex] = 2 which is real
Thus the domain must be values of x less than or equal to zero
