Total number of 6-digit numbers in which only one digit is repeated and all the five digits 1, 3...

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Total number of 6-digit numbers in which only one digit is repeated and all the five digits 1, 3, 5, 7 and 9 appear, is
\( -(a) 5^{6} \)
(b) \( \frac{1}{2} 6 \) !
\( -(c) 6 \) (c)
(d) \( \frac{5}{2}(6 \) !)
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