If \( a=\sqrt[8]{6}-\sqrt[8]{5}, b=\sqrt[8]{6}+\sqrt[8]{5}, c=\sqrt[6]{6}+\sqrt[6]{5}, d= \) \( ...

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If \( a=\sqrt[8]{6}-\sqrt[8]{5}, b=\sqrt[8]{6}+\sqrt[8]{5}, c=\sqrt[6]{6}+\sqrt[6]{5}, d= \) \( \sqrt[4]{6}+\sqrt[4]{5} \), and \( e=\sqrt{6}+\sqrt{5} \), then which of the following is a rational number?
(a) abcde
(b) abde
(c) \( a b \)
(d) \( c d \)
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