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Question #187 Difficulty: 1

According to the C++23 standard, what is the output of this program? 

    #include <iostream>

struct C {
  C() { std::cout << "1"; }
  C(const C& other) { std::cout << "2"; }
  C& operator=(const C& other) { std::cout << "3"; return *this;}
};

int main() {
  C c1;
  C c2 = c1;
}

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