The vectors \(\vec{\imath}+2 p \vec{\jmath}+4 q \vec{k} \text { and } \vec{\imath}+4 p \vec{\jmath}+2 q \vec{k}\) are

1
orthogonal if p = q
2
orthogonal if p = -q 
3
orthogonal if p2 = q2
4
never orthogonal

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