Can some PLEASE help me with this physics question? please show work, I WILL RATE YOU GOOD

(1) (20 pts.) The figure below shows a distribution of four positive point charges, and the dashed line denotes a Gaussian surface enclosing two of the four positive charges. The point P is a point on the Gaussian surface. P 91 92 O 94 93 FIGURE 1 (a) (10 pts.) Which charges contribute to the total electric field at point P? Explain. (b) (10 pts.) Is the value of the the flux through the surface, calculated using only the electric field due to q2 and q3, greater than, equal to, or less than that obtained using the electric field due to all four charges? Explain