If $\vec{\lambda}$ is a unit vector perpendicular to the plane of vectors $\vec{a}$ and $\vec{b}$,and the angle between them is $\theta$,then $\vec{a} \cdot \vec{b}$ will be:
- A$|\vec{a}| |\vec{b}| \sin \theta \vec{\lambda}$
- B$|\vec{a}| |\vec{b}| \cos \theta \vec{\lambda}$
- C$|\vec{a}| |\vec{b}| \cos \theta$
- D$|\vec{a}| |\vec{b}| \sin \theta$
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