What is the output of the following code?
```
#include
using namespace std;
class B
{
public:
~B()
{
cout << "B";
}
};
class A: public B
{
public:
~A()
{
cout << "A";
}
};
int main()
{
A a;
return 0;
}
```
A. A
B. AA
C. BA
D. B
E. AB
E. AB
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