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

1. The W object will be constructed before the constructor to X is called.
2. Z, as a base class of X, will be initialized before the members of X.
3. Y will be initalized during member initialization
4. X's constructor will run.