Final answer:
The subject of this question is Computers and Technology. It involves activities related to allocating memory, administering input/output, and file management on computer systems.
Step-by-step explanation:
The subject of this question is Computers and Technology. The activities described - allocating memory, administering input/output, and file management - are all related to computer systems and operations.
Allocating memory refers to the process of assigning and managing computer memory resources for different tasks and processes. Administrating input/output (I/O) involves handling and controlling the flow of data between a computer system and its peripherals. File management pertains to organizing, storing, and manipulating files on a computer's storage devices.