Here's a third one and an interesting one at that:
Your task is to place a piece on the board as White and checkmate Black.
The correct answer is the one which places the lowest-value piece possible on the board to checkmate Black.
Outside of this piece drop, all rules of regular chess apply, including piece limits (i.e. no more than 8 pawns can be on the board at 1 point.)
Good luck! ;)