Gotedeath: Sorry but the entire series is play to LIVE (as the title suggests), not black to play endgame. If the sequence leads to a living shape it cannot be considered incorrect
d4rkm4tter: It is often not easy to define where the line is between correct and incorrect. Would you consider it correct, if the player sacrifices unnecessarily half of the group to live, what about sacrificing two stones? Collections where inferior solutions lead quickly to an incorrect result have a higher difficulty.
Gotedeath: If the question is purely black to live without yose considerations, N1 (instead of M1 also works as the last move and leaves one less ko threat
Neri: Usually you need to live with maximum points possible to get.
Added your move.