Suppose an infinite non-conducting plane of charge has a uniform negative charge density of sigma. Find the electric field above and below the plate. Sketch the field.

a. Electric field above the plate points away from the plate, below the plate points towards the plate
b. Electric field above the plate points towards the plate, below the plate points away from the plate
c. Electric field points horizontally away from the plate
d. Electric field points horizontally towards the plate