Inner Workings C++ Class - Quiz Explanation

The correct answers are indicated below, along with the text that explains the correct answers.
 
1. The expression cout << ::i means: Please select the best answer.
  A. print the global variable i
  B. print the local variable i
  C. print the value of i in the nearest enclosing scope
  D. none of these
  The correct answer is A.
The use of the scope resolution operator without a class name refers to a variable in global scope.

2. An int i is a static data member of class X if which condition is met:
Please select the best answer.
  A. it is declared static within the class
  B. it is shared by all variables of that class
  C. it is accessible as X::i
  D. all of the above
  The correct answer is D.
All of these are properties of a static data member.

3. If class IN is declared in class OUT and int i is in IN, how would you reference iunambiguously? Please select the best answer.
  A. IN::OUT::i
  B. OUT::i
  C. OUT::IN::i
  D. ::i
  The correct answer is C.
If class IN is declared in class OUT and int i is in IN then OUT::IN::i is how to reference i unambiguously.

4. The this pointer: Please select the best answer.
  A. is const and therefore cannot have its value altered
  B. is available for native types
  C. is mutable and can have its value altered
  D. must be explicitly declared in a class
  The correct answer is A.
In the earlier versions of C++, the this pointer was mutable, but that led to buggy code. The this pointer is unavailable for native types.

5. A static member function: Please select the best answer.
  A. does not have access to this pointer arguments
  B. must be public
  C. is a class variable
  C. none of the above
  The correct answer is A.
The static member function does not have access to this pointer arguments. Any class variables must be passed in through its argument list. A static member function can be private as well as public. When a static member function is defined outside the class declaration, it must not include the static modifier.