Which two statements correctly distinguish between undo and redo data?
A. Undo reverses a change, whereas redo re-creates a change.
B. Redo reverses a change, whereas undo re-creates a change.
C. Undo protects against inconsistent reads, whereas redo protects against data loss.
D. Redo protects against inconsistent reads, whereas undo protects against data loss.
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