Question : identify Apache config directive

My website has a file: www.mydomain.com/contact.php

If I request any of the following (which do not exist), apache serves the contact.php page.
   www.mydomain.com/contact
   www.mydomain.com/contact/
   www.mydomain.com/contact/anything/else/here

How can I determine what part of the apache config to change to disallow this?

The apache server is running on a CentOS 5 box if that makes any difference.

Answer : identify Apache config directive

I found what I needed by setting the options directive for the root directory to:

Options -MultiViews