Which of the following equations does NOT represent a circle in the coordinate plane? A) x² + y² − 6x + 8y + 9 = 0 B) x² + y² + 4x − 2y + 5 = 0 C) x² + y² − 2x + 6y − 6 = 0 D) x² + y² + 10x − 8y + 5 = 0

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