Which of the following statements about n must be true?

Given a positive integer n such that iⁿ = 1, which of the following statements about n must be true? (Note: i² = -1)
A. When n is divided by 4, the remainder is 0.
B. When n is divided by 4, the remainder is 1.
C. When n is divided by 4, the remainder is 2.
D. When n is divided by 4, the remainder is 3.
E. Cannot be determined from the given information.

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