Which one illustrates it? 
A) III
B) II
C) I
D) IV
                                             
                                          
                                          
                                        
											 
											Circuit diagram number II
I) R=(4*8)/(4+8)=8/3 Ω
II) R=4+((4*4)/(4+4))= 6 Ω
III) R= 4/3 Ω
IV) the same as I: 8/3 Ω