The length of the shortest distance between the lines, vector r1 = -3i + 6j + λ(-4i + 3j + 2k) and vector r2 = -2i + 7k + µ (-4i + j + k) is
(A) 9
(B) 6
(C) 3
(D) of these
Correct option: (A) 9
Explanation: