$$\lim_{x \rightarrow 0}\left[\frac{12^x - 3^x - 4^x + 1}{1 - \cos 2x}\right] =$$

A

$$\frac{1}{2} \log 7$$

B

$$\frac{\log 3}{\log 2}$$

C

$$\log 3 . \log 2$$

D

$$\frac{1}{2} \log 12$$