Which of the following describes the indefinite integral ∫1x dx\int \frac{1}{x} \, dx∫x1dx for x<0x < 0x<0?
ln(x)+C\ln(x) + Cln(x)+C
ln(−x)+C\ln(-x) + Cln(−x)+C
x−1+Cx^{-1} + Cx−1+C
UNDEFINED