An intruder attempted malicious activity and exchanged emails with a user and received corporate information, including email distribution lists. The intruder asked the user to engage with a link in an email. When the fink launched, it infected machines and the intruder was able to access the corporate network.
Which testing method did the intruder use?
A . social engineering
B . eavesdropping
C . piggybacking
D . tailgating
Answer: A