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A^2 + A + I = 0

Which answer is correct ?

a. A^-1 = A

b. A^-1 = A^2

c. We can't tell if A is invertable

d.A is not invertable

e. A^-1 = A + I

I have tried to play with the equation, I tried to multiply in A^-1 and to isolate it, but it didn't get me anywhere....I need help

thanks