The effective capacitance across AB of the infinite ladder shown in the below figure is

A. $$\left( {1 + \sqrt 3 } \right)C$$
B. $$\left( {1 + \sqrt 7 } \right)C$$
C. $$\left( {1 + \sqrt 5 } \right)C$$
D. $$\frac{{\left( {1 + \sqrt 5 } \right)}}{2}C$$
Answer: Option D

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