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The lines vec(r)=vec(a)+lambda(vec(b)xxv...

The lines `vec(r)=vec(a)+lambda(vec(b)xxvec(c))&vec(r)=vec(b)+mu(vec(c)xxvec(a))` will intersect, if

A

`vec(a)xxvec(c)=vec(b)xxvec(c)`

B

`vec(a).vec(c)=vec(b).vec(c)`

C

`vec(b)xxvec(a)=vec(c)xxvec(a)`

D

None

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