Less than 9, back to 9 (NFHS)

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I understand that Rule 4-4-1f says that a team can return to 9 players if they drop to 8.

Can this 9th player be:

1. Late arriving player
2. Sick player (not requiring a medical eval)
3. Player from Varsity (game over) playing in a JV game?
4. A player from a different school

An ejected player obviously stays that way, as does a player who have been restricted.

Thanks