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				| 1. | What is the system function of the filter with impulse response hk(n)? | 
| A. | \(\frac{1}{1-W_N^{-k} z^{-1}}\) | 
| B. | \(\frac{1}{1+W_N^{-k} z^{-1}}\) | 
| C. | \(\frac{1}{1-W_N^k z^{-1}}\) | 
| D. | \(\frac{1}{1+W_N^k z^{-1}}\) | 
| Answer» B. \(\frac{1}{1+W_N^{-k} z^{-1}}\) | |