Talia has just returned from a meeting with her manager where they discussed the various vulnerabilities that might impact the organization. They agreed that they were concerned that users might give out information or click on malicious links that they should not click. Which of the following types of testing might help to identify weak areas where the company could improve its employee awareness programs?

a$.$ black hat

b$.$ denial$-$of$-$service

c$.$ DLP

d$.$ social engineering