Which of the following is not an operating system A. DOS B. Linux C. Oracle D. Windows

oracle

An operating system is system software that manages computer hardware and software resources and provides common services for computer programs. Some examples include versions of Microsoft Windows (like Windows 10, Windows 8, Windows 7, Windows Vista, and Windows XP), Apple's macOS (formerly OS X), Chrome OS, BlackBerry Tablet OS, and flavors of the open source operating system Linux. Some examples include Windows Server, Linux, and FreeBSD.An operating system has three main functions: (1) manage the computer's resources, such as the central processing unit, memory, disk drives, and printers, (2) establish a user interface, and (3) execute and provide services for applications software. Oracle is one of the largest vendors in the enterprise IT market and the shorthand name of its flagship product, a relational database management system (RDBMS) that's formally called Oracle Database. It is not an Operating system.

Oracle