A database transaction, by definition, must be ACID (atomic, consistent, isolated and durable). What does "Isolated" mean?
a. "Isolated" means that: Transactions provide an "all-or-nothing" proposition, stating that each work-unit performed in a database must either complete in its entirety or have no effect whatsoever
b. "Isolated" means that: Transactions must not violate any integrity constraints during its execution
c. "Isolated" means that: Transactions that have committed will survive permanently
d. "Isolated" means that: how/when the changes made by one operation in one transaction become visible to other concurrent operations in other transactions
Answer: D