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The _________ requires each transaction executes in two or three different phases in its lifetime

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The _________ requires each transaction executes in two or three different phases in its lifetime

(a) Validation protocol

(b) Timestamp protocol

(c) Deadlock protocol

(d) View protocol

I had been asked this question in examination.

Query is from Validation Based Protocols in chapter Concurrency Control of RDBMS

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Correct choice is (a) Validation protocol

To explain I would say: The validation protocol requires each transaction to execute in two or three different phases in its lifetime depending on whether it is a read only or an update transaction.

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