Which of the below Google search string brings up sites with "config.php" files?

Attackers footprint target Websites using Google Hacking techniques. Google hacking is a term
that refers to the art of creating complex search engine queries. It detects websites that are
vulnerable to numerous exploits and vulnerabilities. Google operators are used to locate specific
strings of text within the search results.
The configuration file contains both a username and a password for an SQL database. Most sites
with forums run a PHP message base. This file gives you the keys to that forum, including FULL
ADMIN access to the database. WordPress uses config.php that stores the database Username
and Password.
Which of the below Google search string brings up sites with “config.php” files?

A.
Search:index config/php

B.
WordPress:index config.php

C.
intitle:index.of config.php

D.
Config.php:index list