Correct Answer - Option 4 : Deadlock-freedom
ACID properties of database transaction:
Atomicity: The entire transaction takes place at once or doesn’t happen at all.
Consistency: The database must be consistent before and after the transaction.
Isolation: Multiple transactions occur independently without interference.
Durability: The changes of a successful transaction occurs even if the system failure occurs.
So, deadlock freedom is not the ACID property of database transaction.