There are three points in the xy-plane, A(a, b), B(c, d), C(d,c). Is AB=AC?
1:($$a^{2}$$-$$b^{2}$$)($$c^{2}$$-$$d^{2}$$)=0
2:($$a^{2}$$+$$b^{2}$$)($$c^{2}$$+$$d^{2}$$)=0
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AStatement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
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BStatement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
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CBoth statements TOGETHER are sufficient, but NEITHER one ALONE is sufficient.
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DEACH statement ALONE is sufficient.
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EStatements (1) and (2) TOGETHER are NOT sufficient.
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正确答案: D