Four persons independently solve a certain problem correctly with p...

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Four persons independently solve a certain problem correctly with probabilities \( \frac{1}{2}, \frac{3}{4}, \frac{1}{4}, \frac{1}{8} \). Then the probability that the problem is solved correctly by at least one of them is
\( \mathrm{P} \)
(A) \( \frac{235}{256} \)
(B) \( \frac{21}{256} \)
(C) \( \frac{3}{256} \)
(D) \( \frac{253}{256} \)
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