Which two statements correctly distinguish between undo and redo data?

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.