Given the tree below, what is the post$-$order traversal?

None of the other answers are correct

$K,E,D,A,J,$ I, $T,M,L,N,U,Z$

$K,E,T,D,J,M,U,A,$ I, $L,N,Z$

A$,$ D$,$ I, J$,$ E$,$ L$,$ N$,$ M$,$ Z$,$ U$,$ T$,$ K

A$,$ D$,$ E$,$ I, J$,$ K$,$ L$,$ M$,$ N$,$ T$,$ U$,$ Z