\( a b, c \) are three positive numbers and \( a b c^{2} \) has the...

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\( a b, c \) are three positive numbers and \( a b c^{2} \) has the greatest value \( \frac{1}{64} \), then
\( \mathrm{P} \)
(a) \( a=b=\frac{1}{2}, c=\frac{1}{4} \)
(b) \( a=b=c=\frac{1}{3} \)
W
(c) \( a=b=\frac{1}{4}, c=\frac{1}{2} \)
(d) \( a=b=c=\frac{1}{4} \)
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