The electric flux through each surface of a cube is given below. Which surfaces of the cube does the electric field run parallel to? 

Φ₁ = 100 Nm² /C           Φ₄ = 0 Nm² /C
Φ₂ = 20 Nm² /C             Φ₅ = −40 Nm² /?
Φ₃ = 0 Nm² /C               Φ₆ = −80 Nm² /?

• A. 1 and 2
• B. 3 and 4
• C. 5 and 6
• D. 1, 2, 5, and 6