Which of the following ACID property states that the system must go from one known state to another and that the system integrity must be maintained?

The correct answer is: A. atomicity

Atomicity is a property of database transactions that ensures that either all of the changes made by a transaction are committed, or none of them are. This means that if a transaction is interrupted, the database will be left in the same state it was in before the transaction began.

Atomicity is important because it ensures that data is always consistent. If a transaction is not atomic, it could leave the database in an inconsistent state, which could lead to data loss or corruption.

The other ACID properties are:

• Consistency: The database must always be in a consistent state. This means that the data must be accurate and complete.
• Isolation: Transactions must be isolated from each other. This means that the changes made by one transaction cannot be seen by another transaction until the first transaction is committed.
• Durability: Once a transaction is committed, the changes made by the transaction must be permanent. This means that the data cannot be lost or corrupted even if there is a system failure.