What are the branches of a river called?

such a name changes the whole

"Branches" extend FROM a stem , in this question a river. Tributaries converge INTO the stem, or river, therefore all the answers are incorrect. I think that's what Marciano said too.

Marciano, you are correct!

Absolutely not! Tributaries or whatever they may be makes up a river, or rivers if a river may decide to split in more than one. Now tell me I am wrong!

longest answer win!!!? 😂