The roots of the equation $x^4 - 4x^3 + 6x^2 - 4x + 1 = 0$ are
- A$1, 1, 1, 1$
- B$2, 2, 2, 2$
- C$3, 1, 3, 1$
- D$1, 2, 1, 2$
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