Transaction Processing Concepts, Concurrency and Recovery

When do 2 operations conflict? Do they have to occur on the same day? A. ? When they both access the same item; are from different transactions and one of them is a write. No. B. ? No. A non-committed transaction can conflict with a later transaction. C. ? When a write and read, delete and update occur at the same time. No. D. ? When one is a read and one is a write if the transaction is still running E. ? 1. actions belong to different transactions, the actions access the same data, (read or write) 2. yes they have to