Which of the following folders contains resources required by the operating system?

A.
/System

B.
/Library

C.
/Sites

D.
/Public

E.
~/Library

Explanation:
System—This folder contains resources required by the operating system for primary functionality.
Users very rarely have to make changes to the contents of this folder. Even administrative users are
unable to make changes to items in the System folder without reauthenticating.