In the given circuit, the switch moves from position a to position b at t = 0. The expression of i (t) for t > 0 is given by:

A. $$i\left( t \right) = \frac{{{V_0}}}{R}\left( {1 - {e^{\frac{{ - t}}{\tau }}}} \right)$$

B. $$i\left( t \right) = \frac{{{V_0}}}{R}\left( {1 - {e^{\frac{{ - 2t}}{\tau }}}} \right)$$

C. $$i\left( t \right) = \frac{{{V_0}}}{{2R}}\left( {1 - {e^{\frac{{ - t}}{\tau }}}} \right)$$

D. $$i\left( t \right) = \frac{{{V_0}}}{R}\left( {1 - {e^{\frac{{ - t}}{{2\tau }}}}} \right)$$

Answer: Option A