Explanation:

- Trap: A type of synchronous interrupt, it is a software-generated interrupt triggered by an error or specific condition in a program.

- Query: Related to requests for information or data from a database. It doesn’t imply the need for immediate action.

- Trigger: Often refers to a database or event-driven action. Not typically a signal emitted by hardware or software for immediate attention.

- Interrupt: A signal emitted by hardware or software indicating that a process or event needs immediate attention. It pauses the current processes to handle the signal.

- None of the above: This option is not applicable since one of the listed options is correct.