 
			 
			MCQOPTIONS
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				| 1. | The normalized auto correlation ρxx(l) is defined as?# | 
| A. | (r<sub>xx</sub> (l))/(r<sub>xx</sub> (0)) | 
| B. | -(r<sub>xx</sub> (l))/(r<sub>xx</sub> (0)) | 
| C. | (r<sub>xx</sub> (l))/(r<sub>xy</sub> (0)) | 
| D. | None of the mentioned | 
| Answer» B. -(r<sub>xx</sub> (l))/(r<sub>xx</sub> (0)) | |