Discussion
How is an enhancement-mode MOSFET usually biased?
Answer: A
A divider from the supply holds the gate above the source by more than the threshold voltage, often combined with a source resistor for stability. Self bias gives the wrong polarity and a negative supply would keep the device off. Because the required polarity differs between the modes, the bias circuit rather than the device is what has to be redrawn when substituting one for the other. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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