An Electric Field Is = (400 N/C) for X

An electric field is = (400 N/C) for x > 0 and = (-400 N/C) for x < 0.A cylinder of length 30 cm and radius 10 cm has its center at the origin and its axis along the x axis such that one end is at x = +15 cm and the other is at x = -15 cm.What is the net outward flux through the entire cylindrical surface?

A) zero
B) 2.5 kN · m²/C
C) 0.50 kN · m²/C
D) 25 N · m²/C
E) 0.25 MN · m²/C