What is the printout of the following code?

```
#include
using namespace std;

class C
{
public:
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. AAA
b. BBB
c. CCC
d. CBA
e. ABC

c. CCC