Given the class inheritance hierarchy where Corporation is a base class and

PublicCorporation and PrivateCorporation are derived classes. Suppose ForProfitPrivate and NonProfitPivate are derived from PrivateCorporation. Suppose that each class is written in C++ and defines a head() member function, and suppose that ph[] is an array of pointers to the Corporation type, and suppose that ph[] is assigned the addresses of one of each of the derived objects as follows:

PublicCorporation pc;

PrivateCorporation pv;

ForProfitPrivate fppv;

NonProfitPrivate nppv; Corporation *ph[4]; ph[0] = &pc; ph[1] = &pv; ph[2] = &fppv;

ph[3] = &nppv;

Explain how ph[i]->head() is interpreted for a given index i if the base class defines head() as follows: (a) Regular non-virtual method (no polymorphism) (b) Virtual method (polymorphism).