If $b$ and $c$ are the lengths of the segments of any focal chord of a parabola $y^2 = 4ax$,then the length of the semi-latus rectum is:
- A$\frac{bc}{b+c}$
- B$\sqrt{bc}$
- C$\frac{b+c}{2}$
- D$\frac{2bc}{b+c}$
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