Question: How many process control blocks (PCB) are there in the OS: one per running process, several for each waiting process, one per user, or something

How many process control blocks (PCB) are there in the OS: one per running process, several for each waiting process, one per user, or something else ( explain)?

-When you do a “fork”, is the new PCB a copy of the parent one (why or why not)?

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