`B_(1)` is a point on the side AC of `DeltaABC` and `B_(1)B` is joined. A line is drawn through a parallel to `B_(1)B` meeting BC at `A_(1)` and another line is drawn through C parallel to `B_(1)B` meeting AB produced at `C_(1)` The

Options

A. `(1)/(C C_(1))-(1)/(A A_(1))=(1)/(B B_(1))`
B. `(1)/(C C_(1))+(1)/(A A_(1))=(1)/(B B_(1))`
C. `(1)/(BB_(1))+(1)/(A A_(1))=(1)/(C C_(1))`
D. `(1)/(A A_(1))+(1)/(C C_(1))=(1)/(B B_(1))`