$\iint(\nabla \times \mathrm{P}) \cdot \mathrm{ds}$, where $\mathrm{P}$ is a vector, is equal to

- $\oint \text{P} \cdot d l$
- $\oint \nabla \times \nabla \times \mathrm{P} \cdot d l$
- $\oint \nabla \times \mathrm{P} \bullet d l$
- $\iiint \nabla \cdot \mathrm{P} d v$