The length of the shortest distance betw...

The length of the shortest distance between the two lines `vecr=(-3hati+6hatj)+s(-4hati+3hatj+2hatk) and vecr=(-2hati+7hatk)=t(-4hati+hatj+hatk)` is (A) 7units (B) 13units (C) 8units (D) 9units

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