Identify the concepts of serial, nonserial, and serializable schedules with their definitions.
1) A schedule where the operations from a set of concurrent transactions are executed in a serial order.
2) A schedule where the operations from a set of concurrent transactions are executed in a non-serial order.
3) A schedule where the operations from a set of concurrent transactions are executed in a way that maintains the consistency of the database.
4) A schedule where the operations from a set of concurrent transactions are executed in a random order.