If \( a_{1}, a_{2} \ldots \ldots . a_{\mathrm{n}} \) are positive real numbers whose product is ...
If \( a_{1}, a_{2} \ldots \ldots . a_{\mathrm{n}} \) are positive real numbers whose product is a fixed number \( \mathrm{c} \), then the minimum value of \( a_{1}+a_{2}+ \) \( .+a_{\mathrm{n}-1}+2 a_{\mathrm{n}} \) is
(a) \( n(2 c)^{1 / n} \)
(b) \( (n+1) c^{1 / n} \)
(c) \( 2 n c^{1 / n} \)
(d) \( (n+1)(2 c)^{1 / n} \)
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