What should my home page be called?

On a PHP web site, your start file (the file to be read when a user visits http: //www.ditdomain.com) must be named one of the following:

1. index.php
2. index.phtml
3. index.shtml
4. index.htm
5. index.html

The files are read in the top to bottom order so that the top name have higher priority than the remaining ones.
Remember there are case-sensitive letters in the file names, so Index.php is not the same as index.php.