Discussion
The autocorrelation of white noise is
Answer: B
Flat spectral density transforms into an impulse at zero lag, so samples taken at any two different instants are uncorrelated: the formal meaning of whiteness. A constant at every lag would describe a direct-current signal. A sinusoidal autocorrelation belongs to a narrowband process, and indeed band-limited noise does show one. Zero at zero lag would mean zero power, so the noise would not exist.
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