How many type of journals can be seen by the teacher?

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.

In which part of a professional email should you try to be brief, but highly descriptive?

Plz ( which is an example of a good url?