we know that
The domain of the function graphed is the interval-------> [3,∞)
[tex]x\geq 3[/tex]
that means
All real numbers greater than or equal to [tex]3[/tex]
The range of the function graphed is the interval --------> [1,∞)
[tex]y\geq 1[/tex]
that means
All real numbers greater than or equal to [tex]1[/tex]
therefore
the answer is the option
[tex]x\geq 3[/tex]
