Which statement is not correct? a. Primary site 2PL comes down to applying the centralized Two- Phase

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Which statement is not correct?

a. Primary site 2PL comes down to applying the centralized Two-

Phase Locking Protocol in a distributed environment.

b. A disadvantage of primary site 2PL is that the central lock manager may become a bottleneck.

c. With distributed 2PL, every site has its own lock manager, which is responsible for managing all locking data pertaining to the fragments stored on that site.

d. Even if the database contains replicated data, applying the basic 2PL protocol still suffices to guarantee serializability.

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