Which of the following describes the vertical shift applied to f(x)=log10(x)f(x) = \log_{10}(x)f(x)=log10(x) to obtain g(x)=log10(x)−4g(x) = \log_{10}(x) - 4g(x)=log10(x)−4?
Shift up by 4
Shift down by 4
Shift left by 4
Shift right by 4