Operating System (OS)
First-in-First-Out (FIFO) scheduling is

Deadline Scheduling
Fair Share Scheduling
Preemptive Scheduling
Non Preemptive Scheduling

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Operating System (OS)
The term 'polling' in a computer means a process by which a computer system

None of these
detects/corrects errors
inquires to see if a terminal has any transaction to send
multiplexes the inputs and updates the memory accordingly
decides correct alternative by analysing several ones

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