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The mean-square of a zero-mean random process is $\frac{kT}{c},$ where $k$ is Boltzmann’s constant, $T$ is the absolute temperature, and $C$ is a capacitance. The standard deviation of the random process is

- $\frac{kT}{c} \\ $
- $\sqrt{\frac{kT}{c}} \\ $
- $\frac{c}{kT} \\ $
- $\frac{\sqrt{kT}}{c}$