Solve the system by the addition method.
A. (2, 
), (2, -
), (-2, 
), (-2, -
)
B. (3, 
), (3, -
), (-3, 
), (-3, -
)
C. (3, 
), (3, -
)
D. (2, 
), (2, -
)
Answer: A
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