Which of the following describes the difference between open source and commercial
operating systems?

A.
Open source operating systems only run on desktop computers, whereas commercial
operating systems run on servers.

B.
Open source operating systems run on standard and non-standard hardware, whereas
commercial operating systems only run on specific hardware.

C.
Open source operating systems can be downloaded and used by everyone, whereas
commercial operating systems can only be used by companies.

D.
Open source operating systems are usually provided free of charge, whereas most
commercial operating systems are usually provided at some cost.