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Select and write the correct answer from the given alternatives in each of the following: Non real complex numbers z satisfying the equation `z^3 + 2z^2 +3z + 2 = 0`

A

a) `(-1 +- sqrt(-7)) / 2`

B

b) `(-1 + sqrt(7i)) / 2`, `(1 - sqrt(7i)) / 2`

C

c) `-i(1 + sqrt(7i)) / 2`, `(-1 - sqrt(7i)) / 2`

D

d) none of these

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