In the figure,a point charge $+Q_1$ is at the centre of an imaginary spherical surface and another point charge $+Q_2$ is outside it. Point $P$ is on the surface of the sphere. Let $\Phi _s$ be the net electric flux through the sphere and $\vec E_p$ be the electric field at point $P$ on the sphere. Which of the following statements is $TRUE$?

• A
  Both charges $+Q_1$ and $+Q_2$ make nonzero contributions to $\Phi _S$ but only the charge $+Q_1$ makes a nonzero contribution to $\vec E_P$.
• B
  Both charges $+Q_1$ and $+Q_2$ make nonzero contributions to $\Phi _S$ but only the charge $+Q_2$ makes a nonzero contribution to $\vec E_P$.
• C
  Only the charge $+Q_1$ makes a nonzero contribution to $\Phi _S$ but both charges $+Q_1$ and $+Q_2$ make nonzero contributions to $\vec E_P$.
• D
  Only the charge $+Q_2$ makes a nonzero contribution to $\Phi _S$ but both charges $+Q_1$ and $+Q_2$ make nonzero contributions to $\vec E_P$.