Which of the following is the correct description of the One Definition Rule? 

Determine the exact text printed to standard output stream by the following code fragment?

namespace A {
  char c {'c'};
}
namespace A {
  char b {'b'};
}
int main() {
  std::cout << A::b;
}

Determine the exact text printed to standard output stream by the following code fragment?

namespace A {
  char c{'c'};
  namespace B { char b{'b'}; }
}
int main() {
  std::cout << A::B::b;
}

Which of the following statements defines a namespace alias AP for a previously defined namespace called AdvancedProgramming?

Determine the exact text printed to standard output stream by the following code fragment?

namespace A {
  char c {'c'};
}
int main() {
  namespace A { char c {'b'}; }
  std::cout << A::c;
}

Write if the following code fragment doesn't compile. Otherwise, write the exact text written to the standard output stream.

namespace {
  double my_sqrt(double x) { return std::sqrt(x); }
}
double my_sqrt(double x) { return std::sqrt(x); }
int main() {
  std::cout << (my_sqrt(25.0) == ::my_sqrt(25.0));
}