17.  Let x(t)= cos(10πt)+cos(30πt) be sampled at 20 Hz and reconstructed using an ideal lowpass filter with cut-off frequency of 20 Hz. The frequency/frequencies present in the reconstructed signal is/are  

(A) 5 Hz and 15 Hz only  

(B) 10 Hz and 15 Hz only  

(C) 5 Hz, 10 Hz and 15 Hz only 

(D) 5 Hz only

Hint: 

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