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Question #28 Difficulty: 1

According to the C++17 standard, what is the output of this program? 

    #include <iostream>

struct A {
  A() { std::cout << "A"; }
  A(const A &a) { std::cout << "B"; }
  virtual void f() { std::cout << "C"; }
};

int main() {
  A a[2];
  for (auto x : a) {
    x.f();
  }
}

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