The correct answer is: A. Open-source
Linux is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically packaged in a Linux distribution.
Linux distributions include the Linux kernel and supporting system software and applications that are typically packaged in a Linux distribution. The operating system is known for its customizability and stability.
Linux is used by a wide range of devices, including servers, supercomputers, mobile phones, and embedded devices. It is also used by some desktop and laptop computers.
Here is a brief explanation of each option:
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A. Open-source
Linux is an open-source operating system, which means that its source code is freely available for anyone to use, modify, and redistribute. This makes Linux a popular choice for developers and businesses, as it allows them to customize the operating system to meet their specific needs. -
B. Microsoft
Microsoft is a multinational technology company that develops, manufactures, licenses, supports, and sells computer software, consumer electronics, personal computers, and related services. Its best known software products are the Microsoft Windows line of operating systems, the Microsoft Office suite, and the Internet Explorer and Edge web browsers. -
C. Windows
Windows is a group of several proprietary graphical operating system families, all of which are developed and marketed by Microsoft. Each family caters to a certain sector of the computing industry. Active Windows families include Windows NT and Windows IoT; these may encompass subfamilies, e.g. Windows Server or Windows Embedded Compact (Windows CE). Defunct Windows families include Windows 9x, Windows Mobile and Windows Phone. -
D. Mac
Mac is a line of personal computers designed, developed, and marketed by Apple Inc. since 1984. The original Macintosh was the first mass-produced personal computer to feature a graphical user interface, which enabled users to interact with the computer using a mouse instead of text commands. -
E. None of these
Linux is not a proprietary operating system, it is an open-source operating system. This means that the source code for Linux is freely available for anyone to use, modify, and redistribute.