Match the statements defined below with the letters labeling their equivalent expressions.

1. $\ln (y^x)$
2. $\ln (x^y)$
3. $\ln (xy)$
4. $\ln \frac xy$

A. $\ln x - \ln y$
B. $\ln x + \ln y$
C. $x \ln y$
D. $y \ln x$

Your overall score for this problem is