Four wires AB, BC, CD and  DA of resistance 4 $\mathrm{\Omega }$ each and fifth wire BD of resistance 8 $\mathrm{\Omega }$ are joined to form a rectangle AB CD of which BD is diagonal. The effective resistance between the points A and B [Fig] is 

• A

  24 $\mathrm{\Omega }$

• B

  16 $\mathrm{\Omega }$

• C

  4/3 $\mathrm{\Omega }$

• D

  8/3$\mathrm{\Omega }$