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If $\overrightarrow{E} = -(2y^3 – 3yz^2)\hat{x} – (6xy^2-3xz^2) \hat{y}+(6xyz) \hat{z}$ is the electric field in a source free region, a valid expression for the electrostatic potential is

1. $xy^3 – yz^2$
2. $2xy^3-xyz^2$
3. $y^3+xyz^2$
4. $2xy^3-3xyz^2$