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Question #7 Difficulty: 1

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

    #include <iostream>

class A {
public:
  void f() { std::cout << "A"; }
};

class B : public A {
public:
  void f() { std::cout << "B"; }
};

void g(A &a) { a.f(); }

int main() {
  B b;
  g(b);
}

Answer:

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