Problem

\lambda, \mu

are real numbers such that,

x^3 - \lambda x^2 + \mu x - 6 = 0

has its real roots and positive, then the minimum value of

\mu

, is a.

3(6)^{1/3}

3(6)^{2/3}

(6)^{1/3}

(6)^{2/3}