The function of OS in the CLI is to form the user interface. Thus, option A is correct.
What is Command Line Interface (CLI)?
The command line interface is given as the application interface that has been used for the purpose of running the program, managing the files, and interacting with the computer system.
The operating system (OS) in the CLI performs the major function of following the link with the interface between the system and the user. Therefore, the function of OS in CLI is the user interface. Thus, option A is correct.
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