In Figure C 10.11, consider calls to virtual methods declared in A, but called through a B, C, or D object view. We could avoid one level of indirection by appending a copy of the A part of the vtable to the D/B and C parts of the vtable (with suitably adjusted this corrections). Give calling sequences for this alternative implementation. In the worst case, howmuch larger may the vtable be for a class with n ancestors?