Question: 9. In a two-phase locking protocol: A. A transaction only acquires a lock after the previously acquired lock has been released B. A transaction acquires

9. In a two-phase locking protocol: A. A transaction only acquires a lock after the previously acquired lock has been released B. A transaction acquires locks as needed. After it starts releasing locks, it does not acquire new lock C. A transaction acquires all needed locks at once, then releases them after completion D. The transaction locks the full database, then releases the locks

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