Everything Can Be Cancelled Off Too?

Algebra Level 3

i×i2×i3×i4××in=1 \large i \times i^2 \times i^3 \times i^4 \times \cdots \times i^n = - 1

The equation above holds true for some positive integer nn. Which of the following is a possible value of nn?

Clarification: i=1i=\sqrt{-1}.

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