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Which of the following would be a line of reflection that would map ABCD onto itself?

Square ABCD with A at negative 3 comma 0, B at negative 3 comma 2, C at negative 1 comma 2, and D at negative 1 comma 0.

y = 2
3x + y = 1
3x + y = −1
−3x + 3y = 9