Two teams $A$ and $B$ have the same mean and their coefficients of variation are $4$ and $2$,respectively. If $\sigma_A$ and $\sigma_B$ are the standard deviations of teams $A$ and $B$ respectively,then the relation between them is
- A$\sigma_A = \sigma_B$
- B$\sigma_B = 2 \sigma_A$
- C$\sigma_A = 2 \sigma_B$
- D$\sigma_B = 4 \sigma_A$
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