7. Define insert ToTail member function of the SLListADT class. The function inserts a new node with the given value at the rear/tail of the list. . Pre-condition: None . Post-condition: The new node is inserted at the rear/tail of the list 8. Define removeFromHead member function of the SLListADT class. The function removes and returns the front/head node from the existing list. . Pre-condition: The list should not be empty. . Post-condition: The head/front node is removed from the list, and the second node is assigned as head. 9. Define removeFromTail member function of the SLListADT class. The function removes and returns the rear/tail node from the existing list . Pre-condition: The list should not be empty. t is retmsoved from tlhe letole assigned as tail