If variables $x$ and $u$ are related by $u = \frac{x - a}{h}$,then the correct relationship between $\sigma_x$ and $\sigma_u$ is:
- A$\sigma_x = |h| \sigma_u$
- B$\sigma_x = h + \sigma_u$
- C$\sigma_u = |h| \sigma_x$
- D$\sigma_u = h + \sigma_x$
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