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Question #133 Difficulty: 2

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

    #include <iostream>
using namespace std;

class A
{
public:
    A() { cout << "A"; }
    A(const A &) { cout << "a"; }
};

class B: public virtual A
{
public:
    B() { cout << "B"; }
    B(const B &) { cout<< "b"; }
};

class C: public virtual A
{
public:
    C() { cout<< "C"; }
    C(const C &) { cout << "c"; }
};

class D:B,C
{
public:
    D() { cout<< "D"; }
    D(const D &) { cout << "d"; }
};

int main()
{
    D d1;
    D d2(d1);
}

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