The shortest distance between the lines $\frac{x+7}{-6} = \frac{y-6}{7} = z$ and $\frac{7-x}{2} = y-2 = z-6$ is\\ (1) $2\sqrt{29}$\\ (2) 1\\ (3) $\sqrt{\frac{37}{2}}$\\ (4) (truncated)