Is it "All three are knaves", "all three are knights", or "one is a knight, another a knave", etc.

All of them (are) knights or knaves.
You don't know if all are knights, all knaves, or some combination.
If there are 3, there can be 3 knights, or 3 knaves, or 2 knights and 1 knave, or 2 knaves and 1 knight.

Thanks!