If the roots of the equation $z^{3}+az^{2}+bz+c=0$ are of unit modulus ($a,b,c$ are complex), then greatest values of $\left| ac \right| $ abd $\left| bc \right|$ respectively are
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If the roots of the equation $z^{3}+az^{2}+bz+c=0$ are of unit modulus ($a,b,c$ are complex), then greatest values of $\left| ac \right| $ abd $\left| bc \right|$ respectively are