Consider the following tree diagrams: 
Which of the above are binary search trees?
Definitions:
Japan
An island country located in East Asia, known for its rich cultural heritage, advanced technology, and strong economy.
European Union
is a political and economic union of 27 European countries that are bound together by various treaties aimed at enhancing economic cooperation, free movement, and common external policies.
Brazil
Brazil is a large South American country known for its diverse culture, tropical landscapes, and as an emerging market within the global economy.
Merchandise Balance
reflects the difference between a country's exports and imports of physical goods, excluding services.
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