The mechanism by which the CPU is interrupted from its current task to handle an event is called an:

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The question asks about the mechanism by which the CPU is interrupted from its current task to handle an event.
Option a: Trap. A trap is a synchronous exception or interrupt triggered by a program, often for system calls or errors, but the term trap emphasizes the software-initiated or fault-driven event handling rather than the general mechanism of interrupting the CPU for events. It is related but not the generic mechanism described.
Option b: Context Switch. A context switch is the process of storing and restoring the CPU state so that multiple processes can share a single CPU. It describes the switching between tasks, not the actual interruption event itself. While frequent during multitasking, it is not the interrupt mechanism per se.
Option c: System Call. A system call is a software interrupt initiated by a program to request services from the operating system. It represents a specific type of interrupt source (software) but does not name the general mechanism that interrupts the CPU to handle events; it’s a use case of interrupts rather than the mechanism.
Option d: Interrupt. An interrupt is the mechanism by which the CPU is diverted from its current task to handle an event (whether hardware or software), after which normal execution can resume. This captures the general concept described in the question and is the standard term used in computer architecture for this behavior.

System Software and Computing Concepts (032025-ABB)

The mechanism by which the CPU is interrupted from its current task to handle an event is called an:

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