Ans is (4) Synchronous interrupt
Classification of Interrupts According to the Temporal Relationship with System Clock:
- Synchronous Interrupt: The source of interrupt is in phase to the system clock is called synchronous interrupt. In other words interrupts which are dependent on the system clock. Example: timer service that uses the system clock.
- Asynchronous Interrupts: If the interrupts are independent or not in phase to the system clock is called synchronous interrupt.
Exception: unplanned interrupts while executing a program is called Exception. For example: while executing a program if we got a value which should be divided by zero is called a exception
Maskable Interrupt: The hardware interrupts which can be delayed when a much highest priority interrupt has occurred to the processor.
Periodic Interrupt: If the interrupts occurred at fixed interval in timeline then that interrupts are called periodic interrupts