An employee in the accounting department recently received a phishing email that instructed them to
click a link in the email to view an important message from the IRS which threatened penalties if a
response was not received by the end of the business day. The employee clicked on the link and the
machine was infected with malware. Which of the following principles BEST describes why this social
engineering ploy was successful?

A.
Scarcity

B.
Familiarity

C.
Social proof

D.
Urgency