g(x)= ?

The graph shows the function f(x) = x² in blue and another function g(x) in red.
Which of the following could be the equation for g(x)? Circle the correct choice.
a g(x) = -x²
b. g(x)=x²-2
c. g(x)=x² + 2
d. g(x) = (x - 2)²