OS (Operating System) is to manage and control the computer hardware and software resources of a computer program. Which of the following are its core functions? (Multiple Choice)

OS (Operating System) is to manage and control the computer hardware and software resources of a computer program. Which of the following are its core functions? (Multiple Choice)
A .  Drive management
B .  File system management
C .  Program management
D .  System call connection

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Answer: ABCD