Refactoring, as it applies to the practice of extreme Programming (XP), refers to:
A. Restructuring the estimate by applying a higher cost performance index during “what if” analysis.
B. Modifying the project due to scope changes, resource availability, and cost and schedule variances.
C. Modifying the cost baseline due to an increased estimate at completion and a negative cost variance.
D. Restructuring of code so as to improve the code without changing its external behavior.
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