A combination of two thin lenses of the same material with focal lengths `f_(1)` and `f_(2)`, arranged on a common axis minimizes chromatic aberration, if the distance between them is
A. `((f_(1)+f_(2)))/4`
B. `((f_(1)+f_(2)))/2`
C. `(f_(1)+f_(2))`
D. `2(f_(1)+f_(2))`
