How would you describe the difference between the graphs of f(x)= {x' and g(x) = {(-x)?
A. g(x) is a reflection of f(x) over the x-axis.
B. g(x) is a reflection of f(x) over the line y = x.
C. g(x) is a reflection of f(x) over the line y = 1.
O D. g(x) is a reflection of f(x) over the y-axis.