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Question #16 Difficulty: 1

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

    #include <iostream>

class A {
public:
  A() { std::cout << 'a'; }
  ~A() { std::cout << 'A'; }
};

class B {
public:
  B() { std::cout << 'b'; }
  ~B() { std::cout << 'B'; }
  A a;
};

int main() { B b; }

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