Find the torque due to an external uniform electric field on a dipole of dipole moment $\;\overrightarrow{P}$

Question

$(a)\;\overrightarrow{E} . \overrightarrow{P}\qquad(b)\;\overrightarrow{P} \times \overrightarrow{E}\qquad(c)\;\overrightarrow{E} \times\overrightarrow{P} \qquad(d)\;None\;of\;these$