If ___________ are not obtained in undo operation it will cause problem in undo-phase.

If ___________ are not obtained in undo operation it will cause proble

1.	If ___________ are not obtained in undo operation it will cause problem in undo-phase.
A.	Higher-level lock
B.	Lower-level lock
C.	Read only lock
D.	Read write
Answer» C. Read only lock

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If ___________ are not obtained in undo operation it will cause problem in undo-phase.

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