The Linux operating system has had an enormous impact on software development and maintenance. From the perspective of technological entrepreneurship and innovation, an especially interesting feature of the development of Linux is:

(a) it is rapidly replacing Microsoft as the principal provider of operating systems for personal computers

(b) its development was funded by venture capital companies that normally support pharmaceutical ventures

(c) it was developed almost entirely by employing newly emerging agile and iterative software development techniques

(d) it is an open-sourced product