Which of the following two versions of the class declarations is correct?
```
Version I:
class A
{
public:
A()
{
}
private:
A* a;
int i;
};
Version II:
class A
{
public:
A()
{
}
private:
A a;
int i;
};
```
a. Both versions are correct.
b. Both versions are wrong.
c. Version II is correct.
d. Version I is correct.
d. Version I is correct.
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Fill in the blank(s) with the appropriate word(s).