Answer: (C) A - 3, B - 2, C - 4, D - 1$$\small\begin{array}{|cl|cl|}\hline \text{(A)} &\text{Thread} & \text{3.} &\text{CPU} \\\hline
\text{(B)}& \text{Virtual address space} & \text{2.}& \text{Memory} \\\hline
\text{(C)} &\text{File system} & \text{4.} &\text{Disk} \\\hline
\text{(D)} &\text{Signal} & \text{1.} &\text{Interrupt} \\\hline \end{array}$$Why?
- Thread & Process are handled by CPU.
- Virtual Address Space is a type of memory address.
- File System is used for disk management.
- Interrupt is a type of signal from Hardware/Software source.