Which function transforms the graph of y=x^2 so that it is first shifted down 2 units and is then reflected across the x-axis?

A. [tex]y=(-x)^2+2[/tex]
B. [tex]y=-x^2+2[/tex]
C. [tex]y=-x^2-2[/tex]
D. [tex]y=-(x+2)^2[/tex]