Final answer:
Countries must meet specific criteria to join the Schengen Area, including issuing uniform Schengen visas, maintaining strong border security, coordinating with other countries' law enforcement, and using the Schengen Information Systems. The option involving the European Economic Community is incorrect as it's now the EU.
Step-by-step explanation:
To join the Schengen Area, countries must meet certain criteria, but the option 'Nations must vote to remain part of the European Economic Community' is not one of them, as the European Economic Community (EEC) has been superseded by the European Union (EU) since the Maastricht Treaty of 1993. The other listed requirements are accurate: nations must issue uniform Schengen visas, show strong security on their external borders, have the capacity to coordinate with law enforcement in other Schengen countries, and connect to and use the Schengen Information Systems for law-enforcement coordination.
Joining the EU itself requires countries to have a stable democracy respecting human rights and the rule of law, a functioning market economy, and the ability to take on the obligations of EU membership, including adherence to EU law. These requirements ensure that EU member states work together to maintain free movement of people, goods, services, and capital within the union, a principle that is deeply integrated with the Schengen Area agreement.