C++: Construction and initialization order guarantees

Question

I have some doubts about construction and initialization order guarantees in C++. For instance, the following code has four classes X, Y, Z

Answer 1

To summarize these are the rules:

1. Arguments, taken from Right to Left
   a. Right Most
   b. 2nd from Right
2. Base class
3. Virtual base
4. Base classes from Left to Right
5. Members in Order of Declaration in class
6. Constructor of called class