Question: For a?R, let f(z)=z5-5z+a. Select the correct statement for ? satisfying f(?)=0.
Options
A : ? has exactly three possible real values for a>4
B : ? has exactly one possible real value for a>4
C : ? has exactly three possible real values for a<-4
D : ? has exactly one possible real value for -4<a<4
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