Given the following C++ code

struct A{};
struct B: public A {};

void b(){
// A
B::A ba;

// B
A::A a1;

//C
class A::A a2;

//D
struct A::A::A a3;
}

Which is declaration is invalid?

Vote first, answer 👇#Cplusplus #CppPolls

— Shafik Yaghmour (@shafikyaghmour) February 15, 2019