You are the administrator for the Certkiller servers and your newly appointed trainee wants to know from you which of the following is the delimiting character for a Unix directory?

A.
/

B.

C.
C:

D.
D:

Explanation:
When you use the Linux file system it has only one top-level directory, represented by the symbol / (pronounced root), Linux has a single entry point, the root directory like in Unix, the root directory for Linux is designated with a single forward slash.
Incorrect
Answers:
B: The back slash method is very popular with the Microsoft operating systems and can be used to brows the disk hierarchy C:etcetc.
C: The drive letter C: is used in the Microsoft windows environment and is normally the first physical storage medium connected to the primary controller.
D: The drive letter D: is used in the Microsoft windows environment and is normally the first physical storage medium connected to the primary controller.
Reference:
Server+ Exam Cram 2 (Exam SK0-002), Charles J. Brooks, Que, November 2005, pg