A uniform wire of resistance `4Omega` is bent into circle of radius `r`. As specimen of the same wire is connected along the dimeter of the circle. What is the equivalent resistance across the ends of this wire?
A. `(4)/((4+pi))Omega`
B. `(3)/((3+pi))Omega`
C. `(2)/((2+pi))Omega`
D. `(1)/((1+pi))Omega`
