C++ quiz. What lines have errors when compiling this code? <

What lines have errors when compiling this code?

#include <iostream>

using namespace std;

class Test
{
public:
    bool flag;
    Test () { flag = false; }
    static int ObjectCount; // 1
    static void POut () // 2
    {
        cout << flag; // 3
        cout << ObjectCount; // 4
    }
};

int Test::ObjectCount = 0; // 5

int main ()
{
    Test T;
}

1 (impossible to declare static class members)
2 (impossible to declare static class functions)
3 (it is impossible to access non-static class members from static class methods
4 (it is impossible to access static class members from class methods)
5 (variable re-declaration)
Code will compile without errors

Explanation

In static function members, it's not possible to access non-static class data members directly. Everything is tied to this pointer. If non-static member functions of a class receive this pointer implicitly, then static member functions of the class do not receive it, since static data members are used by all instances of this class.

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