Listed below are some operating system abstractions (in the left column) and the hardware components or mechanism (in the right column) that they are abstractions of. Which of the following matching of pairs is correct?
(A) A-2, B-4, C-3, D-1
(B) A-1, B-2, C-3, D-4
(C) A-3, B-2, C-4, D-1
(D) A-4, B-1, C-2, D-3
⇒ Threads are handled by CPU.
⇒ Virtual address is a memory type.
⇒ File system is used to manage the disk.
⇒ Interrupt is a signal.
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