When writing put options on these platform do I get assigned the 100 x index (or stock) when the market price is at or below the strike price or if the market price is at or below the strike price on expiration date? Or as it’s a CFD the option is either profitable or not and I am not assigned the index or stock? Also, if I am assigned the index or stock, does this also apply to paper trading? As the other day my paper trade put option I sold was above market price but I was not assigned.