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In the picture A, we are given the graph of the quadratic function $f(x)=\frac{1}{2}{x}^2$. Use the graph of $f$ as help to identify which of the graphs given in the picture B is the graph of $g(x)=\frac{1}{2}{x}^2-2$. Choose what is the colour of the graph of $g$. (Note: The graphs in the picture B were obtained by shifting the graph of $f$.)