When building a phylogenetic tree, where do you place a number used to designate a change in character state? options: at a mark crossing the branch for the species that exhibits the new state at a...

When building a phylogenetic tree, where do you place a number used to designate a change in character state?
options:

at a mark crossing the branch for the species that exhibits the new state

at a node where two branches diverge

at the end of a branch between the last species to exhibit the old state and the first to display the new state