Applying a Bending Moment to a Plate with Forces

[SublimeTouch]

I'm using FEA to simulate an in plane bending moment on a plate.

The moment is 200Nm, and the plate is 80mm tall.

Do I simulate the forces on the edge in situation (a) or situation (b)? It's a seemingly simple question, but people have put doubt in my head, I hoped a fresh mind might help. The length of the arrows represents magnitude, the arrow head represents direction. Shown is the right edge of the plate... That should cover everything.

(a)
|---->
|--->
|-->
|->
|<-
|<--
|<---
|<----

(b)
|->
|-->
|--->
|---->
|<----
|<---
|<--
|<-

A swift answer would be massively appreciated. My brain is frazzled right now.

 

[BigSteve]

The first one is the stress distribution of a moment, assuming the directions are correct.
Basically, the stress is greater as you move away from the central axis, and is 0 at the central axis (assuming pure moment).