ABC Technologies, a Large Financial Company, Hired a Penetration Tester

ABC Technologies, a large financial company, hired a penetration tester to do physical penetration testing. On the first day of his assignment, the penetration tester goes to the company posing as a repairman and starts checking trash bins to collect the sensitive information. What is the penetration tester trying to do?

A) Trying to attempt social Engineering using phishing
B) Trying to attempt social engineering by shoulder surfing
C) Trying to attempt social engineering by eavesdropping
D) Trying to attempt social engineering by dumpster diving