Linux supports a huge list of applications you can possibly think of - For Home and Office uses. Both, the OS and huge list of software packages (GNU GPL) are completely FREE and LEGAL to use.
A
Correct answer
Explanation
Linux distributions come with extensive software repositories that include thousands of free applications for both home and office use. The GNU GPL license makes this software free to use, modify, and distribute legally. However, while the software is libre (free as in freedom) and gratis (no cost), the statement that it's completely legal is correct - these are properly licensed open-source applications.