| If I'm reading right, all three of those are pretty bad. There are two good positions.
1. Thumb over the neck:
Your thumb rests on the top edge of the neck. This is good for relaxing and bending strings, but awful for making stretches.
2. Thumb behind the neck:
Your thumb touches the back of the neck right in the middle. This position will give you great fret-span, but is less relaxed and will make it hard to bend effectively.
Neither your palm nor wrist (!) should touch the back of the neck. Basically, it's thumb or nothing. The bass just doesn't take much force to fret, so all you need is something to stabilize the neck, and your thumb can do that behind the neck or on top of it.
Your wrist should never have a big bend in it. Your position 1 would be like my position 2 if you were to raise your neck to get your wrist straight.
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--Paul Donnelly
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