Q7. Draw step-by-step-evolution of the list structure created by executing the code fragment given below. (20 pts) NodePtr p1, p2, p3; p1 = GetNode(); p1->data = 13; p3 = GetNode(); p3->data = 7; p3->link = GetNode(); p3->link->data = 11; p1->link = p3->link; p2 = GetNode(); p2->link = p1; p2->data = 5; p3->link->link = p2; p1 = GetNode(); p1->data = 9; p1->link = p2; p2->link->link = p3; p3->link->link = p1; p2 = p3 = NULL;