3. (j - k + m - n)² *
A.j² + k² + m² + n² – 2jk + 2jm – 2jn – 2km + 2kn – 2mn
B.j² + k² + m² + n² - 2jk – 2jm – 2jn – 2km – 2kn – 2mn
C.j² + k² + m² + n² + 2jk – 2jm + 2jn - 2km + 2kn – 2mn
D.j² + k² + m² + n² + 2jk – 2jm + 2jn + 2km + 2kn + 2mn
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