Which company developed and now owns Linux?

The correct response indicates that no single company developed and owns Linux. Linux was created by Linus Torvalds in 1991 as a collaborative open-source project, meaning that it's freely available for anyone to use, modify, and distribute. This characteristic is fundamental to Linux's identity as an operating system.

While companies like Red Hat and IBM have made significant contributions to the development of Linux, particularly by offering enterprise solutions and support services, they do not own the Linux kernel or the broader Linux operating system. Microsoft has also engaged with Linux, especially in recent years, by supporting it within its own services, but again does not own it.

The essence of Linux lies in its open-source nature, allowing the community to continuously contribute and evolve the system independently of any single corporate entity. This decentralized model is a core principle of the open-source movement and underscores why the statement that "none of the above" companies own Linux is accurate.