Which of the following commands would a technician use to move one directory above or below the one the technician is currently in?

Which of the following commands would a technician use to move one directory above or below
the one the technician is currently in?

A.
DIR

B.
RD

C.
CD

D.
MD

Explanation:
http://www.lsi.upc.edu/~robert/teaching/foninf/doshelp.html