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A diverging lens of focal length \( f_{1} \) is placed in front of and coaxially with a concave mirror of focal length \( f_{2} \). Their separation is \( d \). A parallel beam of light incident on the lens returns as a parallel beam from the arrangement.
(A) The beam diameters of the incident and reflected beams must be the same
(B) \( d=2\left|f_{2}\right|-\left|f_{1}\right| \)
(C) \( d=\left|f_{2}\right|-\left|f_{1}\right| \)
(D) If the entire arrangement is immersed in water, the conditions will remain unaltered
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