18. A real-valued signal x(t) limited to the frequency band |f| ≤ \(w\over2\) is passed through a linear time  
invariant system whose frequency response is

The output of the system is  

(A) x(t+4)

(B) x(t-4)

(C) x(t+2)

(D) x(t-2)

Hint: 

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