The __________ requires that each transaction Ti executes in two or three different phases in its lifetime, depending on whether it is a read-only or an update transaction.

The __________ requires that each transaction Ti executes in two or th

1.	The __________ requires that each transaction Ti executes in two or three different phases in its lifetime, depending on whether it is a read-only or an update transaction.
A.	Validation protocol
B.	Validation-based protocol
C.	Timestamp protocol
D.	Timestamp-ordering protocol
Answer» B. Validation-based protocol