Which graph represents y=square root of x-4

For this case we have the following function:
 y = root (x-4)
 It is a function in the form of a parabola.
 The domain of the function is:
 [4, inf)
 To make the graph we can make use of a computational tool and verify that the graph corresponds with the mentioned characteristics.
 
 See attached image. (blue function).

Bis the correct answer