Your statement (k) is the same as "only apes are teachers," by the way.
So keep that in mind too. They both have the same diagrams.
f) is correct. Not ape -> monkey (so, not monkey -> ape).
In general, A unless B means not A -> B (if A didn't occur, then B must have). Equivalently, not B -> A (if B didn't occur, then A must have).