The correct answer is C.
OBJ-2.1: Google interprets this statement as @diontraining.com and understands that the user is searching for email addresses since %40 is the hex code for the @ symbol. The * is a wild card character meaning that any text could be substituted for the * in the query. This type of search would provide an attacker with a list of email addresses associated with diontraining.com, which could be used as part of a spear phishing campaign. To return all web pages hosted at diontraining.com, you should use the “site:” modifier in the query. To return all web pages with the text diontraining.com, enter “diontraining.com” into the Google search bar with no modifiers to return those results.