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Question #29 Difficulty: 2

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

    #include <iostream>

struct A {
  A() { foo(); }
  virtual ~A() { foo(); }
  virtual void foo() { std::cout << "1"; }
  void bar() { foo(); }
};

struct B : public A {
  virtual void foo() { std::cout << "2"; }
};

int main() {
  B b;
  b.bar();
}

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