Vectors A and B are 6^i−7^j+6^k and 3^i+4^j+6^k respectively. Their vector difference in unit vector notation will be
9icap -3jcap +12kcap
9icap - 11jcap + 12kcap
10icap -jcap -kcap
3icap -11jcap + 0kcap
Magnitude of vector which comes on addition of two vectors, 6^i+7^j and 3^i+4^j is