What is the printout of the following code?
```
#include
using namespace std;
class C
{
public:
virtual string toString()
{
return "C";
}
};
class B: public C
{
string toString()
{
return "B";
}
};
class A: public B
{
string toString()
{
return "A";
}
};
void displayObject(C p)
{
cout << p.toString();
}
int main()
{
displayObject(A());
displayObject(B());
displayObject(C());
return 0;
}
```
a. BBB
b. CCC
c. ABC
d. CBA
e. AAA
b. CCC
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