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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 S_{y}(f) be the power spectral density of Y(t). Which one of the following statements is correct?

_{y}(f) be the power spectral density of Y(t). Which one of the following statements is correct?

(A) S_{y}(f)>0 for all f |

(B) S_{y}(f)=0 for |f|>1kHz |

(C) S_{y}(f)=0 for f=nf_{0}, f_{0}=2kHz, n any integer |

(D) S_{y}(f)=0 for f=(2n+1)f_{0}=1kHz, n any integer |

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