If c is the unit vector perpendicular to both the vectors a and b ,...

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1. A$\vec{c} \times \vec{a}$
2. B$\vec{c} \times \vec{b}$
3. C$-\frac{(\vec{a} \times \vec{b})}{|\vec{a} \times \vec{b}|}$
4. D$\frac{(\vec{a} \times \vec{b})}{|\vec{a} \times \vec{b}|}$