Answer:
The answer to this question is given below in the explanation section.
Step-by-step explanation:
The correct answer is Linux.
So, the complete sentence would be:
Distros are used to distribute different versions of the Linux operating system.
The distros are the distribution of the different versions of the Linux operating system. Unlike Windows operating system, distros developed by different software collection that is based upon Linux kernel.
Such as Ubuntu is a distro of the Linux operating system. Linux user usually downloads Linux distro operating system for their systems such as ubuntu etc.