If \(\rm {a}=\vec{i}-2 \vec{j}+\vec{{k}}\)\(\rm {b}=\vec{i}+\vec{{k}}, {c}=2 \vec{j}-\vec{{k}}\), then the area (in sq. units) of a parallelogram with diagonals a + b and b + c will be:

1
\(2 \sqrt{14}\)
2
14
3
\(\frac{\sqrt{14}}{2}\)
4
\(\sqrt{14}\)

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