Question: In database systems, what does consistency in the context of transactions mean? A . A transaction is a single, indivisible unit of work. B .

In database systems, what does "consistency" in the context of transactions mean?
A.
A transaction is a single, indivisible unit of work.
B.
The execution of a transaction preserves the consistency of the database.
C.
After the successful execution of a transaction, the changes must persist despite the possibility of system failure.
D.
A transaction must be completed within a specified time.

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