Question: If z is a complex number such that the imaginary part of z is non-zero and a = z 2 + z + 1 is

If z is a complex number such that the imaginary part of z is non-zero and a = z2 + z + 1 is real. Then, a cannot take the value

(a) -1

(b)1/3

(c) 1/2

(d) ¾

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