$\displaystyle{}\iint(\nabla \times \mathrm{P}) \bullet \mathrm{ds},$ where $\mathrm{P}$ is a vector, is equal to
- $\displaystyle{}\oint \text{P} \bullet d l$
- $\displaystyle{}\oint \nabla \times \nabla \times \mathrm{P} \bullet d l$
- $\displaystyle{}\oint \nabla \times \mathrm{P} \bullet d l$
- $\displaystyle{}\iiint \nabla \bullet \mathrm{P} d v$