A a2 + b2 + c2 + 2ab - 2bc + 2ac
B a3 - b2 + c2 - 2ab - 2bc + 2ac
C a2 + b2 + c2 - 2ab - 2bc + 2ac
D a2 + b4 + c2 - 2ab + 2bc + 2ac
Correct Answer: Option C
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