Which directory is the top of the system's file-system hierarchy?A /etcB /C /home/rootD /root

The top of the system's file-system hierarchy is represented by the root directory. In UNIX-like operating systems, this is denoted as /. Let's analyze the options provided:

1. /etc: This directory contains system configuration files but is not at the top of the hierarchy.
2. /C: This is not traditionally recognized in UNIX systems. In some contexts, it may refer to a file system on Windows, but in UNIX/Linux, it does not represent a directory.
3. /home/root: While /home is a directory that typically contains users' home directories, /home/root is not a standard or common directory in the UNIX/Linux system hierarchy.
4. /root: This is the home directory for the root user, but like /etc, it is not the top of the file system hierarchy.

Final Answer

The correct answer is B. /C.