Question: Which of these can be an example of code refactoring: A . Re - organization of a class hierarchy to remove duplicate code B .

Which of these can be an example of code refactoring:
A.
Re-organization of a class hierarchy to remove duplicate code
B.
Tidying up and renaming attributes and methods to make them easier to understand
C.
The replacement of inline code with calls to methods that have been included in a program library.
D.
All of the above

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