Command interpreter is an example of system porgram. In this question the correct option is a i.e Command interpreter
A software that is part of operating systems is known as a system program. System programs provide a platform to other programs or software. Command interpreter is one such example of system programs. Unlike graphical user interface (GUI) based programs, command interpreter handles and processes text commands entered by users or other programs.
Command interpreter provides an interface between users and computers. MS-DOS is an example of a command interpreter. Experienced and advanced users prefer to use command interpreters as they give fast and direct access to operating systems.
Why other options (b, c, and d) are not correct is explained briefly below:
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