Which one of the following options correctly describes the l

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Which one of the following options correctly describes the locations of the roots of the equation s ⁴+s ²+1 =0 on the complex plane?

[GATE EC 2017 Set 1]

A Four left half plane (LHP) roots

B One right half plane (RHP) root, one LHP root and two roots on the imaginary axis

C Two RHP roots and two LHP roots

D All four roots are on the imaginary axis