Which of the Following Statements Relating to Open Source Software

Which of the following statements relating to open source software is true?

A) The flagship OSS product is the Linux operating system, now available on all scales of computing devices.
B) Open source software is available for anyone to download from the Internet, but the code should not be modified.
C) The vast majority of people who work on efforts like Linux are now paid to do so by non-profit organizations such as the Linux foundation.
D) The source code for open source software may be modified and redistributed, provided it is priced reasonably and part of the proceeds is contributed to the Linux Foundation.
E) Major ware firms no longer employ paid staff contributing to open source projects.