[056] Saving Money

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Nov 14, 2012 02:25 exlang-tense exlang-aspect
(A) He saves what little money he earns.
(B) He saves what little money he has earned.
(C) He has saved what little money he earned.
(D) He has saved what little money he has earned.

I'm just interested whether these sentences are correct, not in the differences between what situation they convey.
I'd appreciate your opinions!