In the 1st case there is no expiration of a contract, so no matter what happens you have shares and can wait until the market moves in your favor. All other cases have expirations.
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In the 2nd case, you can lose your initial $19k at expiration, but you will end up with 100 shares.
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In the 2nd case, you can lose up to your initial $19k at expiration, but you will likely end up with 100 shares. There is a 10% chance you will lose the full $19k and not end up with any shares at all.
In the 3rd case, you can lose your initial $2k at expiration, but you will end up with 100 shares.