What grounding points are necessary on an SE analog board?

LaPorta

68LC040
Thus far, I see three different grounding points on the SE analog board: one from the power supply grounding wire, one by the rear of the board where the clip bends back to meet the chassis, and one at the front where the board also attaches to the chassis.

Are all three of these needed? Obviously the power supply one is important, and I would assume one to the chassis from the AB, but which one?

 
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