Pls true or false answer correctly plsss needs help

Explain briefly why you cannot expect to find a previous version of every file with which you work.

Linux is distributed under gnu gpl. why is this important? a. it ensures that only torvalds can profit from the sale of linux b. it prevents unknowledgeable users from downloading programs they don't know how to operate. c. it provides protection for the developers who created linux. d. it states that anyone can copy, modify, and share the program if changes are made public.

Which of the following is not a symptom of chronic fatigue syndrome