Which of the following is NOT characteristic of the EU single market?

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Removal of customs checks at internal bordersAbsence of tariffs on products purchased from other member statesMember states maintain their individual technical regulationsUnified policies on security matters

Explanation

The EU single market features the elimination of border controls (A), no tariffs on goods traded between member countries (B), and common security policies (D). However, it requires harmonization of technical standards rather than allowing each country to keep its own (C), making option C the correct answer.