How to hide revisions tab in quiz module? I am using quiz module in one of my project.

The module seems to be excellent and it satisfies all my need.. thanks to the development team... http://drupal.org/project/quiz

In the mean time i need to do one additional task. And i am struggling  with it..

There is a tab called "Revisions" which will be enabled when some updates are done.

According to my criteria the "Revisions" tab should be hidden always... Is there any way to do this...

Thanks in advance..
It is provided by the Diff module: Disable the new check-box on workflow settings, "Enable revisions page."