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A. 1 → A, 2 → C, 3 → B, 4 → D
B. 1 → E, 2 → D, 3 → F, 4 → A
C. 1 → F, 2 → C, 3 → B, 4 → D
D. 1 → D, 2 → B, 3 → C, 4 → A

D. 1 → D, 2 → B, 3 → C, 4 → A

Concept	Description
1 Multithreading	A Allocates CPU time among processes
2 Virtual Memory	B Uses disk storage as additional RAM
3 Deadlock	C Occurs when two or more processes wait indefinitely for resources
4 Scheduling Algorithm	D Manages multiple threads in a single process
	E Used in embedded systems for real-time processing
	F Manages hardware interruptions for system stability