Using the hierarchy in exercise 18.22 along with class D defined below, and assuming each...

Using the hierarchy in exercise 18.22 along with class D defined below, and assuming each class defines a default constructor, which, if any, of the following conversions are not permitted?

class D : public X, public C { ... };D *pd = new D;

(a) X *px = pd;

(b) A *pa = pd;

(c) B *pb = pd;

(d) C *pc = pd;

Exercise 18.22

Given the following class hierarchy, in which each class defines a default constructor:

class A { ... };class B : public A { ... };class C : public B { ... };class X { ... };class Y { ... };class Z : public X, public Y { ... };class MI : public C, public Z { ... };

what is the order of constructor execution for the following definition?

MI mi;