X(t) is a stationary process with the power spectral density Sx(f)>0 for all f. The process is passed through a system shown below.
Let Sy(f) be the power spectral density of Y(t). Which one of the following statements is correct?
|(A) Sy(f)>0 for all f|
|(B) Sy(f)=0 for |f|>1kHz|
|(C) Sy(f)=0 for f=nf0, f0=2kHz, n any integer|
|(D) Sy(f)=0 for f=(2n+1)f0=1kHz, n any integer|
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