A. $f(x-2)$ shifts the graph of $f(x)$ to the right by 2 units.
B. $f(x)+1$ shifts the graph of $f(x)$ upward by 1 unit.
C. $2f(x)$ stretches the graph of $f(x)$ vertically by a factor of 2.
D. $f(3x)$ compresses the graph of $f(x)$ horizontally by a factor of
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