Wat is de output van het volgende programma?

#include <iostream>

struct A {
  A() { std::cout << "CA"; }
  ~A() { std::cout << "DA"; }
};
struct B: public A {
  A a;
  B() { std::cout << "CB"; }
  ~B() { std::cout << "DB"; }
};

int
main(int, char**) {
B b;
}