What Is a Rule That Applies to the Two-Phase Locking

question 20

Multiple Choice

What is a rule that applies to the two-phase locking protocol?

• A)Two transactions cannot have conflicting locks.
• B)No unlock operation can precede a lock operation in a different transaction.
• C)No data is affected until all locks are released.
• D)No data is affected until the transaction is in its locked position.

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