Find the value of $\lambda$, so that the lines $\frac{1-x}{3} = \frac{7y - 14}{2 \lambda} = \frac{z-3}{2} \;and\; \frac{7-7 \lambda}{3 \lambda} = \frac{y-5}{1} = \frac{6-z}{5} $ are at right angle

Question

$(A)\; \lambda = -\frac{70}{11}$
$(B)\; \lambda = \frac{66}{11}$
$(C)\; \lambda = \frac{70}{11}$
$(D)\; \lambda = -\frac{66}{11}$