Consider the following tree diagrams: 
Which of the above are binary trees?
Definitions:
Document
A written, typed, or electronic matter that provides information or evidence or that serves as an official record.
Cinnamon Buns
A sweet pastry that consists of a rolled sheet of dough upon which a cinnamon and sugar mixture is spread before being rolled into a log shape and sliced into individual portions that are baked.
Bagels
A dense, doughnut-shaped bread roll, typically boiled before being baked, originating from the Jewish communities of Poland.
Unjust Enrichment
A legal principle stating one party should not be allowed to profit at another's expense without making restitution for the fair market value of any benefits received.
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