 
			 
			MCQOPTIONS
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				| 1. | Of the following, which ratio defines the etch factor?$ | 
| A. | Etching depth to undercut | 
| B. | Undercut to etching depth | 
| C. | Undercut to mask area | 
| D. | Mask area to undercut | 
| Answer» C. Undercut to mask area | |