CompTIA PenTest+ (PT0-003) PT0-003 — Question 314

During an assessment of a company, a penetration tester sends the following email to the company's Chief Financial Officer (CFO): Dear CFO, As we talked about during a recent meeting, please open the following attachment that contains the invoice for an existing vendor. If you do not pay this now, we will suspend the licenses for your billing system in three days. GoPay CMS Systems Services - Which of the following techniques is this attack an example of?