Solve the system by the addition method.
A. {(-1, 2), (1, -2)}
B. {(2, 1), (-2, -1)}
C. {(2, 1), (2, -1), (-2, 1), (-2, -1)}
D. {(1, 2), (-1, 2), (1, -2), (-1, -2)}
Answer: C
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