Which of the following are Operating Systems? (a) UNIX (b) Ubuntu (c) Mac (d) Ada
Only (a), (b) and (c)
To determine which of the given options are operating systems, we need to understand the nature of each term listed in the options:
- **UNIX**: UNIX is a powerful, multiuser, multitasking operating system originally developed in the 1970s. It is widely used in servers, workstations, and PCs. Therefore, UNIX is an operating system.
- **Ubuntu**: Ubuntu is a popular Linux distribution based on Debian and is free and open source. It is widely used as a desktop operating system and has server variants, making it an operating system.
- **Mac**: Mac primarily refers to macOS, which is the operating system for Apple computers (formerly known as Mac OS X). Thus, Mac is indeed an operating system.
- **Ada**: Ada is a structured, statically typed, imperative, and object-oriented high-level computer programming language. It is not an operating system.
Given this analysis, options (a) UNIX, (b) Ubuntu, and (c) Mac are operating systems. Option (d), Ada, is not an operating system.
Therefore, the correct answer is: Only (a), (b), and (c).
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