What would you call this kind of activity?

Oregon Corp is fighting a litigation suit with Scamster Inc. Oregon has assigned a private
investigative agency to go through garbage, recycled paper, and other rubbish at Scamster’s office
site in order to find relevant information. What would you call this kind of activity?

A.
CI Gathering

B.
Scanning

C.
Dumpster Diving

D.
Garbage Scooping