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Let ${\mathbf a} = (-6, 2, -7)$ and ${\mathbf b} = (6, 10, 1)$ be vectors. Compute the following vectors.

A. ${\mathbf a} + {\mathbf b} =$ (, , )

B. $-6 {\mathbf a} =$ (, , )

C. ${\mathbf a} - {\mathbf b} =$ (, , )

D. $\left|{\mathbf a}\right| =$

You can earn partial credit on this problem.