Which of the following attacks is being attempted?

An administrator discovers the following log entry on a server:
Nov 12 2013 00:23:45 httpd[2342]: GET /app2/prod/proc/process.php?input=change;cd
%20../../../etc;cat%20shadow
Which of the following attacks is being attempted?

A.
Command injection

B.
Password attack

C.
Buffer overflow

D.
Cross-site scripting