How does the graph of $g(x)=3^x-2$ compare to the graph of $f(x)=3^x$ ?

AThe graph of $g(x)$ is a translation of $f(x)$ 2 units left.

BThe graph of $g(x)$ is a translation of $f(x)$ 2 units right.

CThe graph of $g(x)$ is a translation of $f(x)$ 2 units up.

DThe graph of $g(x)$ is a translation of $f(x)$ 2 units down.