Answer:
Option E. an example of open-source software.
Explanation:
Linux is an open source operating system which is very popular among software developers around the world. For example, web hosting are commonly done in a Linux server. It is first release by Linus Torvalds in 1991. Source code of Linux can be reused, modified and redistributed without any cost by following the terms specified by GNU General Public License. Linux can also be distributed either for non-commercial or commercial purpose. The commercial distribution includes Red Hat and SUSE Linux Enterprise Server.