A) \[\frac{{{D}_{i}}-{{D}_{0}}}{{{D}_{i}}}\]
B) \[\frac{D_{i}^{2}-D_{0}^{2}}{D_{i}^{2}}\]
C) \[\frac{D_{i}^{2}-D_{0}^{2}}{D_{i}^{2}}\]
D) \[\sqrt{\frac{D_{i}^{2}-D_{0}^{2}}{D_{i}^{2}}}\]
Correct Answer: C
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