A) \[ab=cd\]
B) \[{{a}^{2}}+{{d}^{2}}={{c}^{2}}+{{b}^{2}}\]
C) \[{{a}^{2}}+{{c}^{2}}={{b}^{2}}+{{d}^{2}}\]
D) \[{{a}^{2}}+{{b}^{2}}={{c}^{2}}+{{d}^{2}}\]
Correct Answer: D
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